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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 ...
One place to get the numbers is the Library of Congress catalog, although this will tend to give an American ISBN over, say, an Indian (see one of the National Depository Centres) or Australian (see National Library Australia) ISBN. For a Canadian number, you can use the Canadian ISBN Service System – CISS. If you are adding an ISBN, remember ...
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:
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.
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.
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The check digit is there to check whether the main part of the number is correct. If the ISBN is failing to validate, it is likely that there is a typo in the main part of the number. In this case, recalculating the check digit results in an apparently valid ISBN that leads to the wrong source (or to nowhere).