This code system http://terminology.hl7.org/CodeSystem/contributor-summary-source defines the following codes:

Code Display Definition
publisherData Publisher provided Data copied by machine from publisher data.
articleCopy Copied from article Data copied by human from article text.
citationManager Reported by citation manager Data copied by machine from citation manager data.
custom custom format Custom format (may be described in text note).
<status value="draft"/> <experimental value="false"/> <date value="2020-12-28T16:55:11+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="Used to code the producer or rule for creating the display string."/> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/contributor-summary-source"/> <content value="complete"/> <concept> <code value="publisherData"/> <display value="Publisher provided"/> <definition value="Data copied by machine from publisher data."/> </concept> <concept> <code value="articleCopy"/> <display value="Copied from article"/> <definition value="Data copied by human from article text."/> </concept> <concept> <code value="citationManager"/> <display value="Reported by citation manager"/> <definition value="Data copied by machine from citation manager data."/> </concept> <concept> <code value="custom"/> <display value="custom format"/> <definition value="Custom format (may be described in text note)."/> </concept> </CodeSystem>