International Standard Book Number
The International Standard Book Number, ISBN, is a unique commercial book identifier barcode. The ISBN system was created in the United Kingdom, in 1966, by the booksellers and stationers W.H. Smith.
Originally, it was the 9-digit Standard Book Numbering (SBN) code and still was used in 1974; it was adopted as the international standard ISO 2108 in 1970. A similar, numeric identification, the International Standard Serial Number (ISSN), identifies periodical publications such as magazines. Since January 1, 2007, ISBNs are of 13 digits, like in Bookland EAN-13. The TC 46/SC 9 is responsible for the standard.
An ISBN is given to each edition and variation (except reprintings) of a book. The ISBN is 13 digits long if assigned after January 1, 2007, and 10 digits long if assigned before 2007. An International Standard Book Number consists of 4 or 5 parts:
- for a 13 digit ISBN, a GS1 prefix: 978 or 979
- the group identifier code, (group of countries sharing a language) 
- the publisher code,
- the item number, and
- a checksum character or check digit.
The group identifier code (GIC) number is 0 or 1 for English-speaking countries; 2 for French-speaking countries; 3 for German-speaking countries; 4 for Japanese; 5 for Russian, et cetera. The original standard book number (SBN) had no group identifier, but affixing a zero (0) as prefix to a 9-digit SBN creates a valid 10-digit ISBN. The group identifier may be up to 5 digits long; e.g. 99936 is a group identifier for the country Bhutan.
The national ISBN agency assigns the publisher number (cf. the category:ISBN agencies); the publisher selects the item number. Generally, a book publisher is not required to assign an ISBN, nor for a book to display its number (except in China; see below), however, most book stores only handle ISBN bearing merchandise.
A listing of all the 628,000 assigned publisher codes is published, and can be ordered in book form, but, as of 2007, it costs US$300. The web site of the international ISBN agency does not offer any free method of looking up publisher codes.
- Amazon Standard Identification Number (ASIN)
- CODEN (serial publication identifier currently used by libraries; replaced by the ISSN for new works)
- Digital Object Identifier (DOI)
- European Article Number (EAN)
- International Standard Audiovisual Number (ISAN)
- International Standard Music Number (ISMN)
- International Standard Recording Code (ISRC)
- International Standard Serial Number (ISSN)
- International Standard Musical Work Code (ISWC)
- Library of Congress Control Number
- PMID (PubMed ID)
- Serial Item and Contribution Identifier (SICI)
- ↑ Occasionally publishers will use an ISBN for more than one title (e.g. the first edition of "The Ultimate Alphabet" and "The Ultimate Alphabet Workbook" have the same ISBN, 0-8050-0076-3). On the other hand, books can be published with more than one ISBN: A German-as-a-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 (England) and 3-12-675495-3 (Germany).
- ↑ See Frequently Asked Questions about the new ISBN standard from ISO
- ↑ Some books have several codes in the first block, e.g. A.M. Yaglom's Correlation Theory..., published by Springer Verlag, has the ISBNs 0-387-96331-6 and 3-540-96331-6. Though Springer's 387 and 540 codes are different for English (0) and German (3); the same item number 96331 produces the same check digit: 6. Springer uses 431 as their publisher code for Japanese (4) and 4-431-96331-? would also have check digit ? = 6. Other Springer books in English have publisher code 817, and 0-817-96331-? would also get check digit ? = 6. This suggests special considerations were made for assigning Springer's publisher codes, as random assignments of different publisher codes would not lead the same item number to get the same check digit every time. Finding publisher codes for English and German, say, with this effect amounts to solving a linear equation in modular arithmetic.
- ↑ the international ISBN agency's "ISBN User's Manual" says: "The ten-digit number is divided into four parts of variable length, which must be separated clearly, by hyphens or spaces" although permitting their omission for internal data processing, as the prefix code ensures that no two codes begin the same way. If present, hyphens must be correctly placed; See hyphenation instructions at the isbn.org web site.
- ↑ See a complete list of group identifiers .
- ↑ See Publisher's International ISBN Directory
- ISO 2108:2005 at www.iso.org
- Brief Summary of ISBN
- How to find a book from Wikibooks
- ISBN to EAN EAS EBS CONELRAD transition at isbn.org
- Description of the ISBN to EAN upgrade process at bookweb.org
- National and international agencies
- International ISBN Agency —coordinates and supervises the worldwide use of the ISBN system.
- ISBN Agency Australia —Thorpe-Bowker, a division of R R Bowker LLC
- ISBN agency for UK and Republic of Ireland —Nielsen Book
- ISBN agency for US and Puerto Rico — R.R. Bowker LLC
- Numerical List of Group Identifiers List of language/region prefixes
- Online tools
- Special:Booksources, Wikipedia's ISBN search page.
- www.isbn.org/converterpub.asp Free 10-digit to 13-digit conversion tool from the ISBN agency.
- Can also use it to verify ISBNs to see if they are valid. Assures compliance with the full ISBN spec, not just the check digit.
- The ISBN tools website has open-source Java classes to implement 10- and 13-digit ISBNs.
- Publisher access system for Books In Print and Global Books In Print database products
- ISBNdb.com —find books by ISBN, author, title, subject, et cetera; auto-corrects ISBN checksums if needed.
- ISBN.nu —offers free searching of a titles database.
- RFC 3187 Using International Standard Book Numbers as Uniform resource names (URN)
- ISBN-13 For Dummies
- Implementation guidelines (pdf document) for the 13 digit ISBN code.
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