These identifiers create links and are designed to accept a single value. Using multiple values or other text will break the link and/or invalidate the identifier.

• <span id="csdoc_arxiv" />arxiv: arXiv identifier; for example: arxiv=hep-th/9205027
• <span id="csdoc_asin" />asin: Amazon Standard Identification Number
  • <span id="csdoc_asin-tld" />asin-tld: ASIN top-level domain for Amazon sites other than the US; valid values: ca, cn, co.jp, co.uk, de, es, fr, it
• <span id="csdoc_bibcode" />bibcode: Bibcode; used by a number of astronomical data systems; for example: 1974AJ.....79..819H
• <span id="csdoc_doi" />doi: Digital object identifier; for example: 10.1038/news070508-7. It is checked to ensure it begins with (10.).
  • <span id="csdoc_doi_brokendate" />doi_brokendate: Date the DOI is broken; use the same format as other dates in the article.
• <span id="csdoc_isbn" />isbn: International Standard Book Number; for example: 978-0-8126-9593-9. (See: Wikipedia:ISBN and ISBN). Dashes in the ISBN are optional, but preferred. Use the 13-digit ISBN wherever possible; this can normally be found beneath the barcode as a number beginning with 978 or 979 (barcodes beginning with any other numbers are not ISBNs). For sources with the older 9 digit SBN system, prefix the number with a zero; thus, SBN 902888-45-5 should be entered as |isbn=0-902888-45-5. It is checked for length, invalid characters and the proper check digit.
• <span id="csdoc_issn" />issn: International Standard Serial Number; eight characters may be split into two groups of four using a hyphen, but not an en dash or a space.
• <span id="csdoc_jfm" />jfm: Jahrbuch über die Fortschritte der Mathematik
• <span id="csdoc_jstor" />jstor: JSTOR abstract; for example: "jstor=3793107" will generate JSTOR 3793107.
• <span id="csdoc_lccn" />lccn: Library of Congress Control Number
• <span id="csdoc_mr" />mr: Mathematical Reviews
• <span id="csdoc_oclc" />oclc: OCLC
• <span id="csdoc_ol" />ol: Open Library
• <span id="csdoc_osti" />osti: Office of Scientific and Technical Information
• <span id="csdoc_pmc" />pmc: PubMed Central; use article number for full-text free repository of a journal article.
• <span id="csdoc_pmid" />pmid: PubMed; use unique identifier.
• <span id="csdoc_rfc" />rfc: Request for Comments
• <span id="csdoc_ssrn" />ssrn: Social Science Research Network
• <span id="csdoc_zbl" />zbl: Zentralblatt MATH