ISBN

The International Standard Book Number (ISBN) is a numerical book identifier The 10-digit ISBN format was published as an international standard, ISO 2108, in 1970. Since 2007, the ISBN has 13 digits,

Periodical publications such as magazines are identified by the 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) for a 13 digit ISBN, a GS1 prefix: 978 or 979
 * 2) the group identifier, (language-sharing country group) 0 or 1 for English-speaking countries; 2 for French-speaking countries; etc.
 * 3) the publisher code,
 * 4) the item number, and
 * 5) a checksum character or check digit.