# வார்ப்புரு:Citation Style documentation/id2

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>.  

- <b id="csdoc_arxiv">arxiv</b>: arXiv 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_asin">asin</b>: Amazon Standard Identification Number; if first character of **asin** value is a digit, use **isbn**. Because this link favours one specific distributor, include it only if standard identifiers are not available. Example <code>asin=B00005N5PF</code>
  - <b id="csdoc_asin-tld">asin-tld</b>: ASIN top-level domain for Amazon sites other than the US; valid values: <code>au</code>, <code>br</code>, <code>ca</code>, <code>cn</code>, <code>co.jp</code>, <code>co.uk</code>, <code>de</code>, <code>es</code>, <code>fr</code>, <code>it</code>, <code>mx</code>
- <b id="csdoc_bibcode">bibcode</b>: Bibcode; used by a number of astronomical data systems; for example: <code>1974AJ.....79..819H</code>. *Comment:* Techies are aware of the 2019 switch from old to new ADS URLs: the old URLs should continue working after October 2019 even though deprecated; see the April/May 2019 and June 2019 discussions.
- <b id="csdoc_biorxiv">biorxiv</b>: bioRxiv id, a 6-digit number at the end of the biorXiv URL (e.g. <code>078733</code> for http://biorxiv.org/content/early/2016/10/01/078733 or https://dx.doi.org/10.1101/078733)
- <b id="csdoc_citeseerx">citeseerx</b>: CiteSeerX id, a string of digits and dots found in a CiteSeerX URL (e.g. <code>10.1.1.176.341</code> for http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.176.341 )
- <b id="csdoc_doi">doi</b>: எண்ணிம ஆவணச் சுட்டி; for example: <code>10.1038/news070508-7</code>. It is checked to ensure it begins with .
  - <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 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>. 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 . 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 en dash or a space; example <code>issn=2049-3630</code> Alias: **ISSN**
- <b id="csdoc_jfm">jfm</b>: 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 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_mr">mr</b>: Mathematical Reviews; example <code>mr=630583</code>
- <b id="csdoc_oclc">oclc</b>: ; WorldCat's Online Computer Library Center; example <code>oclc=9355469</code>
- <b id="csdoc_ol">ol</b>: Open Library identifier; do not include "OL" in the value; example <code>ol=7030731M</code>
- <b id="csdoc_osti">osti</b>: Office of Scientific and Technical Information; example <code>osti=4367507</code>
- <b id="csdoc_pmc">pmc</b>: PubMed Central; use article number for full-text free repository of a journal article, e.g. <code>pmc=345678</code>. Do not include "PMC" in the value.
  - <b id="csdoc_Embargo">embargo</b>: Date that **pmc** goes live; if this date is in the future, then **pmc** is not linked until that date.
- <b id="csdoc_pmid">pmid</b>: PubMed; use unique identifier; example <code>pmid=17322060</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>: Zentralblatt MATH; example <code>zbl=0472.53010</code> For zbMATH search results like <code>JFM 35.0387.02</code> use <code>jfm=35.0387.02</code>