International Standard Book Number

International Standard Book Number (ISBN) is a number assigned to professionally published books in the modern era. Modern book indexes available on the Internet usually offer the option of finding specific books via their ISBN.[1]

## References[edit]

1. ↑ Bradley, Philip (1992). Book numbering: The importance of the ISBN.. The Indexer. 18 (1): 25–26.

## External links[edit]

* http://www.isbn.org/
* http://www.isbnsearch.org/
* http://www.isbn.nu/