This category encompasses articles that refer to periodicals which need their ISSN numbers added so that Wikipedians can find copies of them. Articles are added to the category by use of the template {{ISSN-needed}}. Articles are also added to this category when an ISSN is not provided in the {{Infobox Journal}} template.

This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a hidden category. It is not shown on its member pages, unless the corresponding user preference (Appearance → Show hidden categories) is set.

To add the tag, type the following:

{{ISSN-needed}}

To find or confirm ISSNs for publications, try the following:

• Library of Congress catalog
• WorldCat advanced search

category:Articles with invalid ISSNs