ISBN
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| File:EAN-13-ISBN-13.svg A 13-digit ISBN, 978-3-16-148410-0, as represented by an EAN-13 bar code | |
| Acronym | ISBN |
|---|---|
| Organisation | International ISBN Agency |
| Introduced | 1970 |
| No. of digits | 13 (formerly 10) |
| Check digit | Weighted sum |
| Example | 978-3-16-148410-0 |
| Website | isbn-international.org |
The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique.
Occasionally, publishers erroneously assign an ISBN to more than one title—the first edition of The Ultimate Alphabet and The Ultimate Alphabet Workbook have the same ISBN, 0-8050-0076-3. Conversely, books are published with several ISBNs: A German second-language edition of Emil und die Detektive}} has the ISBNs 87-23-90157-8 (Denmark), 0-8219-1069-8 (United States), 91-21-15628-X (Sweden), 0-85048-548-7 (United Kingdom) and 3-12-675495-3 (Germany). In some cases, books sold only as sets share ISBNs. For example, the Vance Integral Edition used only two ISBNs for 44 books. Publishers purchase ISBNs from an affiliate of the International ISBN Agency.
An ISBN is assigned to each separate edition and variation (except reprintings) of a publication. For example, an e-book, a paperback and a hardcover edition of the same book will each have a different ISBN. The ISBN is ten digits long if assigned before 2007, and thirteen digits long if assigned on or after 1 January 2007.[lower-alpha 2]
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