Wikiversity:Book sources


 * AddALL
 * AddALL Ebooks
 * Amazon Books
 * Barnes and Noble
 * Copyright Clearance Center
 * Goodreads
 * Google Books
 * LibraryThing
 * Open Library
 * Safari Books Online
 * Universal Digital Library
 * [//www.worldcat.org/search?qt=wikipedia&q=isbn%3AMAGICNUMBER WorldCat]