International Standard Book Number

A 13-digit ISBN, 978-3-16-148410-0, as represented by an EAN-13 bar code
Acronym	ISBN
Introduced	1970  ( 1970 )
Managing organisation	International ISBN Agency
Number of digits	13 (formerly 10)
Check digit	Weighted sum
Example	978-3-16-148410-0
Website	www.isbn-international.org

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• ISO 2108:2005 at www.iso.org
• "Are You Ready for ISBN-13?" . R.R. Bowker LLC.  
• International ISBN Agency ?coordinates and supervises the worldwide use of the ISBN system.
• Numerical List of Group Identifiers List of language/region prefixes
• Free conversion tool: ISBN-10 to ISBN-13 & ISBN-13 to ISBN-10 from the ISBN agency . Also shows correct hyphenation & verifies if ISBNs are valid or not.
• RFC 3187 Using International Standard Book Numbers as Uniform Resource Names (URN)
• Implementation guidelines PDF (51.0 KB) for the 13-digit ISBN code.