Topic summary
eISBN
Extracted from the Wikipedia article ISBN.
Overview
A separate ISBN is assigned to each edition and variation (except reprintings) of a publication. For example, an ebook, audiobook, paperback, and hardcover edition of the same book must each have a different ISBN assigned to it. The ISBN of an electronic publication is often colloquially called "eISBN"; however, no such notation is present in the documentation. Whether a publication is electronic or print cannot be inferred from the ISBN only. The ISBN is thirteen digits long if assigned on or after 1 January 2007, and ten digits long if assigned before 2007. An International Standard Book Number consists of four parts (if it is a 10-digit ISBN) or five parts (for a 13-digit ISBN).