Updated: 04/26/2017 by Computer Hope

The ISBN (International Standard Book Number) is a 10 or 13 digit number used to identify books commercially. The 10 digit version, based upon the nine digit standard book number, was developed by the ISO (International Organization for Standardization), and made official in 1970. In January 2007, ISBN went to a 13 digit standard to be compliant with the European Article Number.

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