Wikipedia:ISBN

The Wikipedia software recognizes inline International Standard Book Numbers (ISBNs).^[1]

The software automatically creates a search link to a specific book.^[2] in the same way that it does for Digital Object Identifiers (DOIs). No template is required to enable this feature.

When a ISBN is known, it may be helpful to use it^[3] in the same way as it is good practice to use DOI for other sources.

It is important when making a link to avoid using a colon after "ISBN" followed by the numbers.

Example

Correct:   ISBN 9780674017535

Incorrect: ISBN: 9780674017535

The formatted citation is displayed as a blue link:

          ISBN 9780674017535

Alternate example

Okay:     13-ISBN 9780674017535

Incorrect: ISBN-13 9780674017535

         13-ISBN 9780674017535

1. ↑ ISBN is an acronym for a "International Standard Book Identifier". The ISBN identifies a published work.
2. ↑ Ayers, Phoebe et al. (2008). How Wikipedia Works: and How You Can Be a Part of It, p. 186.
3. ↑ Ayers, p. 190.