Template:Citation Style documentation/registration

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Citations of online sources that require registration or a subscription are acceptable in Wikipedia as documented in Verifiability § Access to sources. As a courtesy to readers and other editors, editors should signal the access restrictions of the external links included in a citation. Script error: No such module "lang".: access icons do not display correctly for editors who use Modern skin.

Four access levels can be used:

As there are often multiple external links with different access levels in the same citation, these values are attributed to a particular external link.

Access indicators for url-holding parameters

Sources linked by |{{SAFESUBST:#if:url|url=}}, |{{SAFESUBST:#if:article-url|article-url=}}, |{{SAFESUBST:#if:chapter-url|chapter-url=}}, |{{SAFESUBST:#if:contribution-url|contribution-url=}}, |{{SAFESUBST:#if:entry-url|entry-url=}}, |{{SAFESUBST:#if:map-url|map-url=}}, and |{{SAFESUBST:#if:section-url|section-url=}} are presumed to be free-to-read.[1] When they are not free-to-read, editors should mark those sources with the matching access-indicator parameter so that an appropriate icon is included in the rendered citation. Because the sources linked by these url-holding parameters are presumed to be free-to-read, they may not be marked as free.

url-holding and access-indicator parameters
url access allowed keywords
url=}} url-access=}} registration Free registration required
limited Free access subject to limited trial, subscription normally required
subscription Paid subscription required
article-url=}} article-url-access=}}
chapter-url=}} chapter-url-access=}}
contribution-url=}} contribution-url-access=}}
entry-url=}} entry-url-access=}}
map-url=}} map-url-access=}}
section-url=}} section-url-access=}}
Access indicator for named identifiers

Links inserted by named identifiers are presumed to lie behind a paywall or registration barrier – exceptions listed below. When they are free-to-read, editors should mark those sources with the matching access-indicator parameter so that an appropriate icon is included in the rendered citation. Because the sources linked by these named-identifier parameters are not presumed to be free-to-read, they may not be marked as limited, registration, or subscription.

named-identifier and access-indicator parameters
identifier access allowed keywords
bibcode=}} bibcode-access=}} free Freely accessible
doi=}} doi-access=}}
hdl=}} hdl-access=}}
jstor=}} jstor-access=}}
ol=}} ol-access=}}
osti=}} osti-access=}}
s2cid=}} s2cid-access=}}

Some named-identifiers are always free-to-read. For those named-identifiers there are no access-indicator parameters, the access level is automatically indicated by the template. These named identifiers are:

  • |{{SAFESUBST:#if:arxiv|arxiv=}}
  • |{{SAFESUBST:#if:biorxiv|biorxiv=}}
  • |{{SAFESUBST:#if:citeseerx|citeseerx=}}
  • |{{SAFESUBST:#if:pmc|pmc=}}
  • |{{SAFESUBST:#if:rfc|rfc=}}
  • |{{SAFESUBST:#if:ssrn|ssrn=}}
  • This {{#ifeq: Template:Citation Style documentation/registration | Wikipedia:External links |guideline|guidance}} does not restrict linking to websites that are being used as sources to provide content in articles.