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* '''{{para|bibcode}}''': [[Bibcode]]. Empregado por diversos sistemas de datos astronómicos. Exemplo: <code>1974AJ.....79..819H</code>
* '''{{para|doi}}''': [[Digital object identifier]]. Exemplo: <code>10.1038/news070508-7</code>. Debe comezar da forma ({{código|10.}}).
** '''{{para|doi-roto}}''': DateData thena DOIque wasse founddetectou toque beo non-workingDOI atdeixou de funcionar en http://dx.doi.org. Use the same format as other dates in the article. Alias: '''doi_brokendate''', '''doi-inactive-date'''
* '''{{para|isbn}}''': [[International Standard Book Number]]. Exemplo: <code>978-0-8126-9593-9</code>. Os guións son opcionáis, aínda que preferidos. Recoméndase o uso do ISBN impreso no propio libro, e o uso do ISBN de 13 díxitos é preferente ao de 10 díxitos. Fontes antigas cun systema SBN de 9 díxitos, engada un 0 ao comezo. Exemplo: ''SBN 902888-45-5'' debe rexistrarse coma {{para|isbn|0-902888-45-5}}. Equivalente a: '''ISBN'''
* '''{{para|isbn}}''': [[International Standard Book Number]]; for example: <code>978-0-8126-9593-9</code>. (See: [[Wikipedia:ISBN]] and [[ISBN#Overview|ISBN]]). Dashes in the ISBN are optional, but preferred. Use the ISBN actually printed on or in the book. Use the 13-digit ISBN – beginning with 978 or 979 – when it is available. If only a 10-digit ISBN is printed on or in the book, use it. ISBNs can be found on the page with the publisher's information – usually the back of the title page – or 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 {{para|isbn|0-902888-45-5}}. Do not convert a 10-digit ISBN to 13-digit by just adding the 978 prefix; the last digit is a calculated check digit and just making changes to the numbers will make the ISBN invalid. This parameter should hold only the ISBN without ''any'' additional characters. It is checked for length, invalid characters – anything other than numbers, spaces, and hyphens, with "X" permitted as the last character in a 10-digit ISBN – and the proper check digit. Alias: '''ISBN'''
* '''{{para|issn}}''': [[International Standard Serial Number]]; eight characters may be split into two groups of four using a [[hyphen]], but not an [[Dash#En dash|en dash]] or. aOito spacecaracteres.
* '''{{para|jfm}}''': [[Jahrbuch über die Fortschritte der Mathematik]]
* '''{{para|jstor}}''': Abstracto [[JSTOR]]. abstract; for exampleExemplo: <code>jstor=3793107</code> willresulta generateen: [[JSTOR]] [http://www.jstor.org/stable/3793107 3793107].
* '''{{para|lccn}}''': [[Library of Congress Control Number]]. When present, alphabetic prefix characters are to be lower case.
* '''{{para|mr}}''': [[Mathematical Reviews]]
* '''{{para|oclc}}''': [[OCLC]]
* '''{{para|ol}}''': Identificador [[Open Library]] identifier; do not include "OL" in the value.
* '''{{para|osti}}''': [[Office of Scientific and Technical Information]]
* '''{{para|pmc}}''': [[PubMed Central]];. useUse articleo numbernúmero forde full-textartigo freepara repositoryo ofrepositorio acompleto journalde article,texto e.ggratuíto dun artigo. Exemplo: <code>pmc=345678</code>. DoNon not includeinclúa "PMC" in theno valuevalor. SeeÉ distinto á also {{para|pmid}} below; these are two different identifiers.
** '''{{para|embargo}}''': DateData thatna que o '''pmc''' goes live;estará ifdispoñible. thisSe datea isdata iné theno futurefuturo, theno '''pmc''' isnon notquedará linkedligado untilata thatesa datedata.
* '''{{para|pmid}}''': [[PubMed]];. useUse uniqueo identifieridentificador único. SeeÉ alsodistinto á {{para|pmc}} above; these are two different identifiers.
* '''{{para|rfc}}''': [[Request for Comments]]
* '''{{para|ssrn}}''': [[Social Science Research Network]]
* '''{{para|zbl}}''': [[Zentralblatt MATH]]
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