Template:Please check ISBN/doc

Usage
This template is used to mark an International Standard Book Number that may not be valid. Example:

ISBN 1-897311-56-7

The template does not produce any visible change to the article:

ISBN 1-897311-56-7

Rather, it adds the article to Category:Articles with invalid ISBNs.

Parameters
The optional parameter reason simply provides a comment to explain why the ISBN may not be valid. Example:

ISBN 1-897311-56-7