A publishing secret that could prevent you from getting your book reveiwed, in books in print and into bookstores.
The International Standard Book Number (ISBN) is a unique, numerical commercial book identifier, based upon the 9-digit Standard Book Numbering (SBN) code created in the UK by the booksellers and stationers W.H. Smith and others in 1966. The 10-digit International Standard Book Number (ISBN) format was developed by the International Organization for Standardization and published as an international standard, ISO 2108, in 1970. (However, the 9-digit SBN code was used in the UK until 1974.) Currently, the ISO TC 46/SC 9 is responsible for the standard.
Since 1 January 2007, International Standard Book Numbers have been of 13 digits, compatible with Bookland EAN-13s.
A similar numeric identifier, the International Standard Serial Number (ISSN) identifies periodical publications such as magazines.
The code is divided into four parts usually separated by a hyphen: three fields (all digits) and a checksum character (which may be a digit or the letter 'X'). The first-field is a single digit 'group identifier' which indicates the country or language (or the geographic area) in which the work was published (0 and 1 identify English-speaking countries). The second field identifies the producer or the publisher of the work. The third-field specifies a particular title (or a revised edition) produced by that publisher.