diff --git a/src/rp-schematron-base.sch b/src/rp-schematron-base.sch
index 4ab9c427ba..88a537fe63 100644
--- a/src/rp-schematron-base.sch
+++ b/src/rp-schematron-base.sch
@@ -459,6 +459,10 @@
        <report test="matches(lower-case(.),'^i{1,3}\.\s') and parent::*/article-title" 
         role="warning" 
         id="journal-source-2">Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has a source that starts with a roman numeral. Is part of the article-title captured in source? Source = <value-of select="."/>.</report>
+
+       <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" 
+        role="warning" 
+        id="journal-source-3">Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
      </rule>
     </pattern>
 
@@ -506,6 +510,10 @@
         <report test="matches(lower-case(.),'\.\s+in:\s+')" 
         role="warning" 
         id="book-source-2">The source in book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) contains '. In: ' - <value-of select="."/>. Are the details captured correctly?</report>
+
+        <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" 
+        role="warning" 
+        id="book-source-3">Book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
       </rule>
     </pattern>
 
diff --git a/src/rp-schematron.sch b/src/rp-schematron.sch
index c10466b84a..273f6029cc 100644
--- a/src/rp-schematron.sch
+++ b/src/rp-schematron.sch
@@ -299,6 +299,8 @@
        
 
        <report test="matches(lower-case(.),'^i{1,3}\.\s') and parent::*/article-title" role="warning" id="journal-source-2">[journal-source-2] Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has a source that starts with a roman numeral. Is part of the article-title captured in source? Source = <value-of select="."/>.</report>
+
+       <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="journal-source-3">[journal-source-3] Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
      </rule></pattern>
 
     <pattern id="preprint-ref-checks-pattern"><rule context="mixed-citation[@publication-type='preprint']" id="preprint-ref-checks">
@@ -322,6 +324,8 @@
         <report test="matches(lower-case(.),'^chapter\s|\s+chapter\s+')" role="warning" id="book-source-1">[book-source-1] The source in book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) contains 'chapter' - <value-of select="."/>. Are the details captured correctly?</report>
         
         <report test="matches(lower-case(.),'\.\s+in:\s+')" role="warning" id="book-source-2">[book-source-2] The source in book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) contains '. In: ' - <value-of select="."/>. Are the details captured correctly?</report>
+
+        <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="book-source-3">[book-source-3] Book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
       </rule></pattern>
 
     <pattern id="ref-list-checks-pattern"><rule context="ref-list" id="ref-list-checks">
diff --git a/src/rp-schematron.xsl b/src/rp-schematron.xsl
index 2795ef91b9..9a11cf7ef8 100644
--- a/src/rp-schematron.xsl
+++ b/src/rp-schematron.xsl
@@ -2248,6 +2248,21 @@
                <xsl:text/>.</svrl:text>
          </svrl:successful-report>
       </xsl:if>
+      <!--REPORT warning-->
+      <xsl:if test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')">
+         <svrl:successful-report xmlns:svrl="http://purl.oclc.org/dsdl/svrl" test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')">
+            <xsl:attribute name="id">journal-source-3</xsl:attribute>
+            <xsl:attribute name="role">warning</xsl:attribute>
+            <xsl:attribute name="location">
+               <xsl:apply-templates select="." mode="schematron-select-full-path"/>
+            </xsl:attribute>
+            <svrl:text>[journal-source-3] Journal reference (<xsl:text/>
+               <xsl:value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>
+               <xsl:text/>) has the following source, '<xsl:text/>
+               <xsl:value-of select="."/>
+               <xsl:text/>'. Should it be captured as a conference proceeding instead?</svrl:text>
+         </svrl:successful-report>
+      </xsl:if>
       <xsl:apply-templates select="*" mode="M32"/>
    </xsl:template>
    <xsl:template match="text()" priority="-1" mode="M32"/>
@@ -2410,6 +2425,21 @@
                <xsl:text/>. Are the details captured correctly?</svrl:text>
          </svrl:successful-report>
       </xsl:if>
+      <!--REPORT warning-->
+      <xsl:if test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')">
+         <svrl:successful-report xmlns:svrl="http://purl.oclc.org/dsdl/svrl" test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')">
+            <xsl:attribute name="id">book-source-3</xsl:attribute>
+            <xsl:attribute name="role">warning</xsl:attribute>
+            <xsl:attribute name="location">
+               <xsl:apply-templates select="." mode="schematron-select-full-path"/>
+            </xsl:attribute>
+            <svrl:text>[book-source-3] Book reference (<xsl:text/>
+               <xsl:value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>
+               <xsl:text/>) has the following source, '<xsl:text/>
+               <xsl:value-of select="."/>
+               <xsl:text/>'. Should it be captured as a conference proceeding instead?</svrl:text>
+         </svrl:successful-report>
+      </xsl:if>
       <xsl:apply-templates select="*" mode="M35"/>
    </xsl:template>
    <xsl:template match="text()" priority="-1" mode="M35"/>
diff --git a/test/tests/rp/book-ref-source-checks/book-source-3/book-source-3.sch b/test/tests/rp/book-ref-source-checks/book-source-3/book-source-3.sch
new file mode 100644
index 0000000000..5870f534ca
--- /dev/null
+++ b/test/tests/rp/book-ref-source-checks/book-source-3/book-source-3.sch
@@ -0,0 +1,157 @@
+<schema xmlns="http://purl.oclc.org/dsdl/schematron" xmlns:meca="http://manuscriptexchange.org" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:file="java.io.File" xmlns:java="http://www.java.com/" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xlink="http://www.w3.org/1999/xlink" queryBinding="xslt2">
+  <title>eLife reviewed preprint schematron</title>
+  <ns uri="http://www.niso.org/schemas/ali/1.0/" prefix="ali"/>
+  <ns uri="http://www.w3.org/XML/1998/namespace" prefix="xml"/>
+  <ns uri="http://www.w3.org/1999/xlink" prefix="xlink"/>
+  <ns uri="http://www.w3.org/2001/XInclude" prefix="xi"/>
+  <ns uri="http://www.w3.org/1998/Math/MathML" prefix="mml"/>
+  <ns uri="http://saxon.sf.net/" prefix="saxon"/>
+  <ns uri="http://purl.org/dc/terms/" prefix="dc"/>
+  <ns uri="http://www.w3.org/2001/XMLSchema" prefix="xs"/>
+  <ns uri="https://elifesciences.org/namespace" prefix="e"/>
+  <ns uri="java.io.File" prefix="file"/>
+  <ns uri="http://www.java.com/" prefix="java"/>
+  <ns uri="http://manuscriptexchange.org" prefix="meca"/>
+  <xsl:function name="e:isbn-sum" as="xs:integer">
+    <xsl:param name="s" as="xs:string"/>
+    <xsl:choose>
+      <xsl:when test="string-length($s) = 10">
+        <xsl:variable name="d1" select="number(substring($s,1,1)) * 10"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 9"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1)) * 8"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 7"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1)) * 6"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 5"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1)) * 4"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1)) * 2"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 1"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10) mod 11"/>
+      </xsl:when>
+      <xsl:when test="string-length($s) = 13">
+        <xsl:variable name="d1" select="number(substring($s,1,1))"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 3"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1))"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 3"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1))"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 3"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1))"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1))"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 3"/>
+        <xsl:variable name="d11" select="number(substring($s,11,1))"/>
+        <xsl:variable name="d12" select="number(substring($s,12,1)) * 3"/>
+        <xsl:variable name="d13" select="number(substring($s,13,1))"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10 + $d11 + $d12 + $d13) mod 10"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="number('1')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:is-valid-issn" as="xs:boolean">
+      <xsl:param name="s" as="xs:string"/>
+      <xsl:choose>
+        <xsl:when test="not(matches($s,'^\d{4}\-\d{3}[\dX]$'))">
+          <xsl:value-of select="false()"/>
+        </xsl:when>
+        <xsl:otherwise>
+            <xsl:variable name="d1" select="number(substring($s,1,1)) * 8"/>
+            <xsl:variable name="d2" select="number(substring($s,2,1)) * 7"/>
+            <xsl:variable name="d3" select="number(substring($s,3,1)) * 6"/>
+            <xsl:variable name="d4" select="number(substring($s,4,1)) * 5"/>
+            <xsl:variable name="d5" select="number(substring($s,6,1)) * 4"/>
+            <xsl:variable name="d6" select="number(substring($s,7,1)) * 3"/>
+            <xsl:variable name="d7" select="number(substring($s,8,1)) * 2"/>
+            <xsl:variable name="remainder" select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7) mod 11"/>
+            <xsl:variable name="calc" select="if ($remainder=0) then 0 else (11 - $remainder)"/>
+            <xsl:variable name="check" select="if (substring($s,9,1)='X') then 10 else number(substring($s,9,1))"/>
+            <xsl:value-of select="$calc = $check"/>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:function>
+  <xsl:function name="e:get-name" as="xs:string">
+    <xsl:param name="name"/>
+    <xsl:choose>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="$name/surname[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="'No elements present'"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-copyright-holder">
+    <xsl:param name="contrib-group"/>
+    <xsl:variable name="author-count" select="count($contrib-group/contrib[@contrib-type='author'])"/>
+    <xsl:choose>
+      <xsl:when test="$author-count lt 1"/>
+      <xsl:when test="$author-count = 1">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1]"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/name[1]/surname[1]"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      <xsl:when test="$author-count = 2">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:choose>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab and $contrib-group/contrib[@contrib-type='author'][2]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author']/collab[2]/text()[1])"/>
+              </xsl:when>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+              </xsl:when>
+              <xsl:otherwise>
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/collab[1]/text()[1])"/>
+              </xsl:otherwise>
+            </xsl:choose>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      
+      <xsl:otherwise>
+        <xsl:variable name="is-equal-contrib" select="if ($contrib-group/contrib[@contrib-type='author'][1]/@equal-contrib='yes') then true() else false()"/>
+        
+        <xsl:value-of select="concat(e:get-surname($contrib-group/contrib[@contrib-type='author'][1]),' et al')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-surname" as="text()">
+    <xsl:param name="contrib"/>
+    <xsl:choose>
+      <xsl:when test="$contrib/collab">
+        <xsl:value-of select="$contrib/collab[1]/text()[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="$contrib//name[1]/surname[1]"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <pattern id="book-ref-source-checks-pattern">
+    <rule context="mixed-citation[@publication-type='book']/source" id="book-ref-source-checks">
+      <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="book-source-3">[book-source-3] Book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
+    </rule>
+  </pattern>
+  <pattern id="root-pattern">
+    <rule context="root" id="root-rule">
+      <assert test="descendant::mixed-citation[@publication-type='book']/source" role="error" id="book-ref-source-checks-xspec-assert">mixed-citation[@publication-type='book']/source must be present.</assert>
+    </rule>
+  </pattern>
+</schema>
\ No newline at end of file
diff --git a/test/tests/rp/book-ref-source-checks/book-source-3/fail.xml b/test/tests/rp/book-ref-source-checks/book-source-3/fail.xml
new file mode 100644
index 0000000000..012c5d1403
--- /dev/null
+++ b/test/tests/rp/book-ref-source-checks/book-source-3/fail.xml
@@ -0,0 +1,13 @@
+<?oxygen SCHSchema="book-source-3.sch"?>
+<!--Context: mixed-citation[@publication-type='book']/source
+Test: report    matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')
+Message: Book reference () has the following source, ''. Should it be captured as a conference proceeding instead? -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <ref id="c1">
+            <mixed-citation publication-type="book">
+                <source>Proceedings of the 20th International Conference on World Wide Web</source>
+            </mixed-citation>
+        </ref>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/book-ref-source-checks/book-source-3/pass.xml b/test/tests/rp/book-ref-source-checks/book-source-3/pass.xml
new file mode 100644
index 0000000000..859623ec91
--- /dev/null
+++ b/test/tests/rp/book-ref-source-checks/book-source-3/pass.xml
@@ -0,0 +1,13 @@
+<?oxygen SCHSchema="book-source-3.sch"?>
+<!--Context: mixed-citation[@publication-type='book']/source
+Test: report    matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')
+Message: Book reference () has the following source, ''. Should it be captured as a conference proceeding instead? -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <ref id="c1">
+            <mixed-citation publication-type="book">
+                <source>eLife</source>
+            </mixed-citation>
+        </ref>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/journal-source-checks/journal-source-3/fail.xml b/test/tests/rp/journal-source-checks/journal-source-3/fail.xml
new file mode 100644
index 0000000000..98bf626335
--- /dev/null
+++ b/test/tests/rp/journal-source-checks/journal-source-3/fail.xml
@@ -0,0 +1,13 @@
+<?oxygen SCHSchema="journal-source-3.sch"?>
+<!--Context: mixed-citation[@publication-type='journal']/source
+Test: report    matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')
+Message: Journal reference () has the following source, ''. Should it be captured as a conference proceeding instead? -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <ref id="c1">
+            <mixed-citation publication-type="journal">
+                <source>Proceedings of the 20th International Conference on World Wide Web</source>
+            </mixed-citation>
+        </ref>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/journal-source-checks/journal-source-3/journal-source-3.sch b/test/tests/rp/journal-source-checks/journal-source-3/journal-source-3.sch
new file mode 100644
index 0000000000..16c8f6d797
--- /dev/null
+++ b/test/tests/rp/journal-source-checks/journal-source-3/journal-source-3.sch
@@ -0,0 +1,158 @@
+<schema xmlns="http://purl.oclc.org/dsdl/schematron" xmlns:meca="http://manuscriptexchange.org" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:file="java.io.File" xmlns:java="http://www.java.com/" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xlink="http://www.w3.org/1999/xlink" queryBinding="xslt2">
+  <title>eLife reviewed preprint schematron</title>
+  <ns uri="http://www.niso.org/schemas/ali/1.0/" prefix="ali"/>
+  <ns uri="http://www.w3.org/XML/1998/namespace" prefix="xml"/>
+  <ns uri="http://www.w3.org/1999/xlink" prefix="xlink"/>
+  <ns uri="http://www.w3.org/2001/XInclude" prefix="xi"/>
+  <ns uri="http://www.w3.org/1998/Math/MathML" prefix="mml"/>
+  <ns uri="http://saxon.sf.net/" prefix="saxon"/>
+  <ns uri="http://purl.org/dc/terms/" prefix="dc"/>
+  <ns uri="http://www.w3.org/2001/XMLSchema" prefix="xs"/>
+  <ns uri="https://elifesciences.org/namespace" prefix="e"/>
+  <ns uri="java.io.File" prefix="file"/>
+  <ns uri="http://www.java.com/" prefix="java"/>
+  <ns uri="http://manuscriptexchange.org" prefix="meca"/>
+  <xsl:function name="e:isbn-sum" as="xs:integer">
+    <xsl:param name="s" as="xs:string"/>
+    <xsl:choose>
+      <xsl:when test="string-length($s) = 10">
+        <xsl:variable name="d1" select="number(substring($s,1,1)) * 10"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 9"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1)) * 8"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 7"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1)) * 6"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 5"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1)) * 4"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1)) * 2"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 1"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10) mod 11"/>
+      </xsl:when>
+      <xsl:when test="string-length($s) = 13">
+        <xsl:variable name="d1" select="number(substring($s,1,1))"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 3"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1))"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 3"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1))"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 3"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1))"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1))"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 3"/>
+        <xsl:variable name="d11" select="number(substring($s,11,1))"/>
+        <xsl:variable name="d12" select="number(substring($s,12,1)) * 3"/>
+        <xsl:variable name="d13" select="number(substring($s,13,1))"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10 + $d11 + $d12 + $d13) mod 10"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="number('1')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:is-valid-issn" as="xs:boolean">
+      <xsl:param name="s" as="xs:string"/>
+      <xsl:choose>
+        <xsl:when test="not(matches($s,'^\d{4}\-\d{3}[\dX]$'))">
+          <xsl:value-of select="false()"/>
+        </xsl:when>
+        <xsl:otherwise>
+            <xsl:variable name="d1" select="number(substring($s,1,1)) * 8"/>
+            <xsl:variable name="d2" select="number(substring($s,2,1)) * 7"/>
+            <xsl:variable name="d3" select="number(substring($s,3,1)) * 6"/>
+            <xsl:variable name="d4" select="number(substring($s,4,1)) * 5"/>
+            <xsl:variable name="d5" select="number(substring($s,6,1)) * 4"/>
+            <xsl:variable name="d6" select="number(substring($s,7,1)) * 3"/>
+            <xsl:variable name="d7" select="number(substring($s,8,1)) * 2"/>
+            <xsl:variable name="remainder" select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7) mod 11"/>
+            <xsl:variable name="calc" select="if ($remainder=0) then 0 else (11 - $remainder)"/>
+            <xsl:variable name="check" select="if (substring($s,9,1)='X') then 10 else number(substring($s,9,1))"/>
+            <xsl:value-of select="$calc = $check"/>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:function>
+  <xsl:function name="e:get-name" as="xs:string">
+    <xsl:param name="name"/>
+    <xsl:choose>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="$name/surname[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="'No elements present'"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-copyright-holder">
+    <xsl:param name="contrib-group"/>
+    <xsl:variable name="author-count" select="count($contrib-group/contrib[@contrib-type='author'])"/>
+    <xsl:choose>
+      <xsl:when test="$author-count lt 1"/>
+      <xsl:when test="$author-count = 1">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1]"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/name[1]/surname[1]"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      <xsl:when test="$author-count = 2">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:choose>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab and $contrib-group/contrib[@contrib-type='author'][2]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author']/collab[2]/text()[1])"/>
+              </xsl:when>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+              </xsl:when>
+              <xsl:otherwise>
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/collab[1]/text()[1])"/>
+              </xsl:otherwise>
+            </xsl:choose>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      
+      <xsl:otherwise>
+        <xsl:variable name="is-equal-contrib" select="if ($contrib-group/contrib[@contrib-type='author'][1]/@equal-contrib='yes') then true() else false()"/>
+        
+        <xsl:value-of select="concat(e:get-surname($contrib-group/contrib[@contrib-type='author'][1]),' et al')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-surname" as="text()">
+    <xsl:param name="contrib"/>
+    <xsl:choose>
+      <xsl:when test="$contrib/collab">
+        <xsl:value-of select="$contrib/collab[1]/text()[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="$contrib//name[1]/surname[1]"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <pattern id="journal-source-checks-pattern">
+    <rule context="mixed-citation[@publication-type='journal']/source" id="journal-source-checks">
+      <let name="preprint-regex" value="'biorxiv|africarxiv|arxiv|cell\s+sneak\s+peak|chemrxiv|chinaxiv|eartharxiv|medrxiv|osf\s+preprints|paleorxiv|peerj\s+preprints|preprints|preprints\.org|psyarxiv|research\s+square|scielo\s+preprints|ssrn|vixra'"/>
+      <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="journal-source-3">[journal-source-3] Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
+    </rule>
+  </pattern>
+  <pattern id="root-pattern">
+    <rule context="root" id="root-rule">
+      <assert test="descendant::mixed-citation[@publication-type='journal']/source" role="error" id="journal-source-checks-xspec-assert">mixed-citation[@publication-type='journal']/source must be present.</assert>
+    </rule>
+  </pattern>
+</schema>
\ No newline at end of file
diff --git a/test/tests/rp/journal-source-checks/journal-source-3/pass.xml b/test/tests/rp/journal-source-checks/journal-source-3/pass.xml
new file mode 100644
index 0000000000..96fc998fa0
--- /dev/null
+++ b/test/tests/rp/journal-source-checks/journal-source-3/pass.xml
@@ -0,0 +1,13 @@
+<?oxygen SCHSchema="journal-source-3.sch"?>
+<!--Context: mixed-citation[@publication-type='journal']/source
+Test: report    matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')
+Message: Journal reference () has the following source, ''. Should it be captured as a conference proceeding instead? -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <ref id="c1">
+            <mixed-citation publication-type="journal">
+                <source>eLife</source>
+            </mixed-citation>
+        </ref>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/xspec/rp-schematron.sch b/test/xspec/rp-schematron.sch
index 2e689d7535..5496de00a8 100644
--- a/test/xspec/rp-schematron.sch
+++ b/test/xspec/rp-schematron.sch
@@ -347,6 +347,8 @@
        
 
        <report test="matches(lower-case(.),'^i{1,3}\.\s') and parent::*/article-title" role="warning" id="journal-source-2">Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has a source that starts with a roman numeral. Is part of the article-title captured in source? Source = <value-of select="."/>.</report>
+
+       <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="journal-source-3">Journal reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
      </rule>
   </pattern>
 
@@ -377,6 +379,8 @@
         <report test="matches(lower-case(.),'^chapter\s|\s+chapter\s+')" role="warning" id="book-source-1">The source in book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) contains 'chapter' - <value-of select="."/>. Are the details captured correctly?</report>
         
         <report test="matches(lower-case(.),'\.\s+in:\s+')" role="warning" id="book-source-2">The source in book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) contains '. In: ' - <value-of select="."/>. Are the details captured correctly?</report>
+
+        <report test="matches(lower-case(.),'^(symposium|conference|proc\.?|proceeding|meeting|workshop)|\s?(symposium|conference|proc\.?|proceeding|meeting|workshop)\s?|(symposium|conference|proc\.?|proceeding|meeting|workshop)$')" role="warning" id="book-source-3">Book reference (<value-of select="if (ancestor::ref/@id) then concat('id ',ancestor::ref/@id) else 'no id'"/>) has the following source, '<value-of select="."/>'. Should it be captured as a conference proceeding instead?</report>
       </rule>
   </pattern>
 
diff --git a/test/xspec/rp-schematron.xspec b/test/xspec/rp-schematron.xspec
index 86b70f6bcb..db1a687e02 100644
--- a/test/xspec/rp-schematron.xspec
+++ b/test/xspec/rp-schematron.xspec
@@ -589,6 +589,16 @@
         <x:expect-report id="journal-source-2" role="warning"/>
         <x:expect-not-assert id="journal-source-checks-xspec-assert" role="error"/>
       </x:scenario>
+      <x:scenario label="journal-source-3-pass">
+        <x:context href="../tests/rp/journal-source-checks/journal-source-3/pass.xml"/>
+        <x:expect-not-report id="journal-source-3" role="warning"/>
+        <x:expect-not-assert id="journal-source-checks-xspec-assert" role="error"/>
+      </x:scenario>
+      <x:scenario label="journal-source-3-fail">
+        <x:context href="../tests/rp/journal-source-checks/journal-source-3/fail.xml"/>
+        <x:expect-report id="journal-source-3" role="warning"/>
+        <x:expect-not-assert id="journal-source-checks-xspec-assert" role="error"/>
+      </x:scenario>
     </x:scenario>
     <x:scenario label="preprint-ref-checks">
       <x:scenario label="preprint-ref-source-pass">
@@ -685,6 +695,16 @@
         <x:expect-report id="book-source-2" role="warning"/>
         <x:expect-not-assert id="book-ref-source-checks-xspec-assert" role="error"/>
       </x:scenario>
+      <x:scenario label="book-source-3-pass">
+        <x:context href="../tests/rp/book-ref-source-checks/book-source-3/pass.xml"/>
+        <x:expect-not-report id="book-source-3" role="warning"/>
+        <x:expect-not-assert id="book-ref-source-checks-xspec-assert" role="error"/>
+      </x:scenario>
+      <x:scenario label="book-source-3-fail">
+        <x:context href="../tests/rp/book-ref-source-checks/book-source-3/fail.xml"/>
+        <x:expect-report id="book-source-3" role="warning"/>
+        <x:expect-not-assert id="book-ref-source-checks-xspec-assert" role="error"/>
+      </x:scenario>
     </x:scenario>
     <x:scenario label="ref-list-checks">
       <x:scenario label="indistinct-ref-labels-pass">