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

{{ISBN|1-897311-56-7}}{{Please check ISBN}}

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.


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

{{ISBN|1-897311-56-7}}{{Please check ISBN|reason=Check digit (7) does not correspond to calculated figure.}}

See also