Category:Articles with invalid ISMNs

This is a maintenance category of articles with invalid ISMNs. It is often included by means of the templates and, which should be located next to the ISMN with the problem.

Articles can also be included in this category if an ISMN within the ISMN template is not valid.

The most likely reason is a bad checksum, (see ISMN) which probably means there is a typing error in the ISMN.

See also Category:CS1 errors: ISMN