A standard for identifying books around the world, the ISBN is also a great identifier when working with the iBookstore. Partners can use 13 digit ISBN numbers to perform look up queries using the Search API as well as easily create links to the iBookstore.

Search API - Look Up The Search API - Look Up tool supports queries using the ISBN 13 digit ID. The syntax for these queries is simply http://itunes.apple.com/lookup?isbn=<isbn number> where <isbn number> is the 13 digit value.

For example, to retrieve price, cover art and other relevant information about Michael Connelly's book "The Fifth Witness" the query would be: http://itunes.apple.com/lookup?isbn=9780316069359.

Building Links Partners can also build links into the iBookstore by concatenating the 13 digit ISBN to the end of a pre-formated link. Following the format outlined below an iBookstore link can easily be programmatically built.
http://itunes.apple.com/<country abbreviation>/book/isbn<isbn number>

For example, using the ISBN from before, the link to this book would be: http://itunes.apple.com/us/book/isbn9780316069359

These links can also be affiliated using any of the methods mentioned in the Advanced Linking documentation.

Converting ISBNs Please note that the methods mentioned above rely on 13 digit ISBN numbers. Partners that have a 10 digit ISBN will need to have it converted. This can be done with the ISBN-13 Online Converter tool or following these instructions.