The method of assigning an ISBN is nation-specific and varies between countries, often depending on how large the publishing industry is within a country. The ISBN is ten digits long if assigned before 2007, and thirteen digits long if assigned on or after 1 January 2007. For example, an e-book, a paperback and a hardcover edition of the same book will each have a different ISBN. Īn ISBN is assigned to each separate edition and variation (except reprintings) of a publication. Publishers purchase ISBNs from an affiliate of the International ISBN Agency. The International Standard Book Number ( ISBN) is a numeric commercial book identifier which is intended to be unique.
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