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

Code Display Definition
vancouver Vancouver style Citation style used by International Committee of Medical Journal Editors and maintained by US National Library of Medicine.
ama11 American Medical Association 11th edition Medicine.
apa7 American Psychological Association 7th edition APA 7th edition (October 2019) used by Education, Psychology and Sciences.
apa6 American Psychological Association 6th edition APA 6th edition used by Education, Psychology and Sciences.
asa6 American Sociological Association 6th edition Sociology.
mla8 Modern Language Association 8th edition MLA 8th edition used by the Humanities.
cochrane Cochrane Style Used by Cochrane reviews, example: Huang, M, Tang T, Pang, P, Li, M, Ma R, Lu, J, et al. Treating COVID-19 with Chloroquine. J Mol Cell Biol 2020; 12(4):322–5.
elsevier-harvard Elsevier-Harvard Style Biology ecology.
nature Nature Referencing style Biology.
acs American Chemical Society Chemistry.
chicago-a-17 Chicago Style Version 17 Author Date Used by Business, History and the Fine Arts.
chicago-b-17 Chicago Style Version 17 Full note Used by Business, History and the Fine Arts.
ieee Institute of Electrical and Electronics Engineers IT, Engineering.
comppub Computable Publishing Citation style to report human-readable and/or machine-readable access paths, example: Alper BS, Dehnbostel J, Shahin K. 14-day mortality remdesivir vs placebo meta-analysis (ACTT-1, Wang et al, WHO SOLIDARITY). Fast Evidence Interoperability Resources (FEvIR) Platform, entry 55, version 4. Created 2020 Dec 17. Revised 2020 Dec 21. Accessed 2021 Mar 13. Computable resource at: https://fevir.net/resources/Evidence/55.
<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="The format for display of the citation."/> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/citation-summary-style"/> <content value="complete"/> <concept> <code value="vancouver"/> <display value="Vancouver style"/> <definition value="Citation style used by International Committee of Medical Journal Editors and maintained by US National Library of Medicine."/> </concept> <concept> <code value="ama11"/> <display value="American Medical Association 11th edition"/> <definition value="Medicine."/> </concept> <concept> <code value="apa7"/> <display value="American Psychological Association 7th edition"/> <definition value="APA 7th edition (October 2019) used by Education, Psychology and Sciences."/> </concept> <concept> <code value="apa6"/> <display value="American Psychological Association 6th edition"/> <definition value="APA 6th edition used by Education, Psychology and Sciences."/> </concept> <concept> <code value="asa6"/> <display value="American Sociological Association 6th edition"/> <definition value="Sociology."/> </concept> <concept> <code value="mla8"/> <display value="Modern Language Association 8th edition"/> <definition value="MLA 8th edition used by the Humanities."/> </concept> <concept> <code value="cochrane"/> <display value="Cochrane Style"/> <definition value="Used by Cochrane reviews, example: Huang, M, Tang T, Pang, P, Li, M, Ma R, Lu, J, et al. Treating COVID-19 with Chloroquine. J Mol Cell Biol 2020; 12(4):322–5."/> </concept> <concept> <code value="elsevier-harvard"/> <display value="Elsevier-Harvard Style"/> <definition value="Biology ecology."/> </concept> <concept> <code value="nature"/> <display value="Nature Referencing style"/> <definition value="Biology."/> </concept> <concept> <code value="acs"/> <display value="American Chemical Society"/> <definition value="Chemistry."/> </concept> <concept> <code value="chicago-a-17"/> <display value="Chicago Style Version 17 Author Date"/> <definition value="Used by Business, History and the Fine Arts."/> </concept> <concept> <code value="chicago-b-17"/> <display value="Chicago Style Version 17 Full note"/> <definition value="Used by Business, History and the Fine Arts."/> </concept> <concept> <code value="ieee"/> <display value="Institute of Electrical and Electronics Engineers"/> <definition value="IT, Engineering."/> </concept> <concept> <code value="comppub"/> <display value="Computable Publishing"/> <definition value="Citation style to report human-readable and/or machine-readable access paths, example: Alper BS, Dehnbostel J, Shahin K. 14-day mortality remdesivir vs placebo meta-analysis (ACTT-1, Wang et al, WHO SOLIDARITY). Fast Evidence Interoperability Resources (FEvIR) Platform, entry 55, version 4. Created 2020 Dec 17. Revised 2020 Dec 21. Accessed 2021 Mar 13. Computable resource at: https://fevir.net/resources/Evidence/55."/> </concept> </CodeSystem>