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Language tagging; minor edits
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. In general, the parameters should include only the variable part of the identifier, e.g. <code>rfc=822</code> or <code>pmc=345678</code>.
When an URL is equivalent to the link produced by the corresponding identifier (such as a [[Digital object identifier|DOI]]), don't add it to any URL parameter but use the appropriate identifier parameter, which is more stable and may allow to specify the [[Helphelp:Citation_Style_1#Registration_or_subscription_required|access status]]. The {{para|url}} parameter or title link can then be used for its prime purpose of providing a [[Wikipediawikipedia:Citing_sources#Convenience_links|convenience link]] to an [[open access]] copy which would not otherwise be obviously accessible.
* <b id="csdoc_arxiv">arxiv</b>: [[arXiv]] [https://arxiv.org/help/arxiv_identifier identifier]; for example: <code>arxiv=hep-th/9205027</code> (before April 2007) or <code>arxiv=0706.0001</code> (April 2007 – December 2014) or <code>arxiv=1501.00001</code> (since January 2015). Do not include extraneous file extensions like ".pdf" or ".html".
* <b id="csdoc_doi">doi</b>: [[Digital object identifier]]; for example: <code>10.1038/news070508-7</code>. It is checked to ensure it begins with ({{code|10.}}).
** <b id="csdoc_doi_brokendate">doi-broken-date</b>: Date the DOI was found to be non-working at https://dx.doi.org. Use the same format as other dates in the article. Alias: '''doi-inactive-date'''
* <b id="csdoc_eissn">eissn</b>: [[International Standard Serial Number]] for the electronic media of a serial publication; eight characters may be split into two groups of four using a [[hyphen]], but not an [[Dashdash#En dash|en dash]] or a space; example <code>eissn=1557-2986</code> Alias: '''EISSN'''
* <b id="csdoc_hdl">hdl</b>: [[Handle System]] identifier for digital objects and other resources on the Internet; example <code>hdl=20.1000/100</code> Alias: '''HDL'''
* <b id="csdoc_isbn">isbn</b>: [[International Standard Book Number]]; for example: <code>978-0-8126-9593-9</code>. {{crossref|(See [[Wikipedia:ISBN]] and {{section link|ISBN|Overview}}.)}} Hyphens 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'''
* <b id="csdoc_ismn">ismn</b>: [[International Standard Music Number]]; for example: <code>979-0-9016791-7-7</code>. [[Hyphens]] or spaces in the ISMN are optional. Use the ISMN actually printed on or in the work. This parameter should hold only the ISMN without ''any'' additional characters. It is checked for length, invalid characters – anything other than numbers, spaces, and hyphens – and the proper check digit. Alias: '''ISMN'''
* <b id="csdoc_issn">issn</b>: [[International Standard Serial Number]]; eight characters may be split into two groups of four using a [[hyphen]], but not an [[Dashdash#En dash|en dash]] or a space; example <code>issn=2049-3630</code> Alias: '''ISSN'''* <b id="csdoc_jfm">jfm</b>: {{lang|de|[[Jahrbuch über die Fortschritte der Mathematik]]}}; example <code>jfm=53.0144.01</code>
* <b id="csdoc_jstor">jstor</b>: [[JSTOR]] reference number; for example: <code>jstor=3793107</code> will generate [[JSTOR]] [https://www.jstor.org/stable/3793107 3793107].
* <b id="csdoc_lccn">lccn</b>: [[Library of Congress Control Number]]. When present, alphabetic prefix characters are to be lower case; example <code>lccn=2004042477</code>
* <b id="csdoc_rfc">rfc</b>: [[Request for Comments]]; example <code>rfc=3143</code>
* <b id="csdoc_ssrn">ssrn</b>: [[Social Science Research Network]]; example <code>ssrn=1900856</code>
* <b id="csdoc_zbl">zbl</b>: {{lang|de|[[Zentralblatt MATH]]|italic=no}}; example <code>zbl=0472.53010</code> For zbMATH search results like <code>JFM 35.0387.02</code> use <code>jfm=35.0387.02</code>