ISBN

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The International Standard Book Number (ISBN) is a numerical book identifier^[1] The 10-digit ISBN format was published as an international standard (ISO 2108) in 1970. Since 2007, the ISBN has 13 digits,^[2] Periodical publications such as magazines are identified by the similar International Standard Serial Number (ISSN).

An ISBN is assigned to each edition and variation (except reprintings) of a book, and has 4 or 5 parts:

1. a 13-digit ISBN has a GS1 prefix: 978 or 979
2. a group identifier, (language-sharing country group) this is 0 or 1 for English-speaking countries; 2 for French-speaking countries; etc.^[3]
3. the publisher code,^[4]
4. the item number, and
5. a checksum character or check digit.^[5]

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