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Appendix 1 of the International ISBN Agency's official user manual [17]: 33 describes how the 13-digit ISBN check digit is calculated. The ISBN-13 check digit, which is the last digit of the ISBN, must range from 0 to 9 and must be such that the sum of all the thirteen digits, each multiplied by its (integer) weight, alternating between 1 and 3 ...
In 2007, the length of an ISBN changed from 10 to 13 digits, and a new 3-digit prefix (978 or 979) was added in front of 10-digit ISBNs. [2] The following registration groups are compatible with or without a 978- prefix:
ISBNs come in two styles, containing 10 digits or 13 digits, and are known as "ISBN-10" and "ISBN-13" numbers. Please use the ISBN-13 if both are provided by the original work. The ISBN-13 is often found near the barcode and will start with either 978- or 979-.
For instance, the UPC-A barcode for a box of tissues is "036000241457". The last digit is the check digit "7", and if the other numbers are correct then the check digit calculation must produce 7. Add the odd number digits: 0+6+0+2+1+5 = 14. Multiply the result by 3: 14 × 3 = 42. Add the even number digits: 3+0+0+4+4 = 11.
Verhoeff had the goal of finding a decimal code—one where the check digit is a single decimal digit—which detected all single-digit errors and all transpositions of adjacent digits. At the time, supposed proofs of the nonexistence [6] of these codes made base-11 codes popular, for example in the ISBN check digit.
Also, the number starts after the colon for "ISBN-10:" and "ISBN-13:" numbers. An ISBN identifies a specific edition of a book. Any given title may therefore have a number of different ISBNs. See #Find other editions below for finding other editions. An ISBN registration, even one corresponding to a book page on a major book distributor ...
The Publisher Item Identifier (PII) is a unique identifier used by a number of scientific journal publishers to identify documents. [1] It uses the pre-existing ISSN or ISBN of the publication in question, and adds a character for source publication type, an item number, and a check digit.
Special:BookSources is the page to which each ISBN links. It links to many sources for a book throughout the world. You can also manually enter an ISBN – but you should click the linked ISBN to WP:Verify that the link is good. Category:International Standard Book Number includes all Wikipedia articles and templates directly related to ISBNs.