Category:CS1 maint: work parameter with ISBN

This is a tracking category.

It is used to build and maintain a list or lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of the encyclopedia's categorization scheme.

More information:

• This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set.
• These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
• These categories also serve to aggregate members of several lists or subcategories into a larger, more efficient list (discriminated by classifications).
• Typically, tracking categories are automatically populated by templates invoked in pages or by the MediaWiki software (see Special:TrackingCategories for an overview of the latter).

Administrators: Please do not delete this category as empty!

This category may be empty occasionally or even most of the time.

This is a tracking category for instances of the {{citation}} template that use |isbn= and that also use any of the work parameters |journal=, |magazine=, |newspaper=, |periodical=, |website=, or |work=. Note that this category applies only to instances of {{citation}}, and not templates that start with "cite", such as {{cite book}}.

{{Citation}} uses the presence of a work parameter to switch from 'book' mode to 'periodical' mode. This switch changes the static text that Module:Citation/CS1 emits in the rendered citation and the key/value pairs that it emits for the citation's metadata. Because ISBNs do not apply to periodicals, the combination of a |work= alias with |isbn= should not occur.

In erroneous usages, |title= has been used to hold a book chapter, and |work= (or alias) has been used to hold the book's title. To fix these errors, ensure that the assigned ISBN is correct, that |title= holds the book's title and |chapter= (or appropriate alias) names the cited chapter/section/article/etc. Pages in this category should only be added by Module:Citation/CS1.

A common source of these malformed {{citation}} templates appears to be the Visual Editor and/or Citoid.

Pages with this condition are automatically placed in Category:CS1 maint: work parameter with ISBN.^[a]

By default, Citation Style 1 and Citation Style 2 error messages are visible to all readers and maintenance messages are hidden from all readers.

To display maintenance messages in the rendered article, include the following text in your common CSS page (common.css) or your specific skin's CSS page and (skin.css).

(Note to new editors: those CSS pages are specific to you, and control your view of pages, by adding to your user account's CSS code. If you have not yet created such a page, then clicking one of the .css links above will yield a page that starts "Wikipedia does not have a user page with this exact name." Click the "Start the User:username/filename page" link, paste the text below, save the page, follow the instructions at the bottom of the new page on bypassing your browser's cache, and finally, in order to see the previously hidden maintenance messages, refresh the page you were editing earlier.)

:root .mw-parser-output .cs1-maint {display: inline;} /* display Citation Style 1 maintenance messages */

To display hidden-by-default error messages:

:root .mw-parser-output .cs1-hidden-error {display: inline;} /* display hidden Citation Style 1 error messages */

Even with this CSS installed, older pages in Wikipedia's cache may not have been updated to show these error messages even though the page is listed in one of the tracking categories. A null edit will resolve that issue.

After (error and/maintenance) messages are displayed, it might still not be easy to find them in a large article with a lot of citations. Messages can then be found by searching (with Ctrl+F) for "(help)" or "cs1".

To hide normally-displayed error messages:

:root .mw-parser-output .cs1-visible-error {display: none;} /* hide Citation Style 1 error messages */

You can personalize the display of these messages (such as changing the color), but you will need to ask someone who knows CSS or at the technical village pump if you do not understand how.

Nota bene: these CSS rules are not obeyed by Navigation popups. They also do not hide script warning messages in the Preview box that begin with "This is only a preview; your changes have not yet been saved".