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.

    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[edit source]

    Sources linked by |url=, |article-url=, |chapter-url=, |contribution-url=, |entry-url=, |map-url=, and |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[edit source]

    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:

    • |arxiv=
    • |biorxiv=
    • |citeseerx=
    • |pmc=
    • |rfc=
    • |ssrn=
    1. This guidance does not restrict linking to websites that are being used as sources to provide content in articles.