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.

• arxiv: arXiv identifier; for example: arxiv=hep-th/9205027
• asin: Amazon Standard Identification Number
  • 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
• bibcode: Bibcode; used by a number of astronomical data systems; for example: 1974AJ.....79..819H
• doi: Digital object identifier; for example: 10.1038/news070508-7. It is checked to ensure it begins with (10.).
  • doi_brokendate: Date the DOI is broken; use the same format as other dates in the article.
• 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. Alias: ISBN
• 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.
• jfm: Jahrbuch über die Fortschritte der Mathematik
• jstor: JSTOR abstract; for example: "jstor=3793107" will generate JSTOR 3793107.
• lccn: Library of Congress Control Number
• mr: Mathematical Reviews
• oclc: OCLC
• ol: Open Library
• osti: Office of Scientific and Technical Information
• pmc: PubMed Central; use article number for full-text free repository of a journal article.
• pmid: PubMed; use unique identifier.
• rfc: Request for Comments
• ssrn: Social Science Research Network
• zbl: Zentralblatt MATH