ISBNs (International Standard Book Numbers) are unique 10- or 13-digit numbers used by publishers to identify printed books, eBooks, video, audio, etc. You can typically find the ISBN near the bar code on the back cover of a book or on a package sticker. The ISBN will also be listed on the copyright page of a book. If there is more than one set of numbers on your book, the ISBN code is easily identified because the letters ISBN always appear before the number. If you are entering an ISBN number into the search bar, do not include dashes or spaces.
To access purchased content or to download files from the Companion Website, you will need to create an account and register your product.Sign in to an existing account or register a new Cheng & Tsui account and enter your product key exactly as it appears.
(Note: Some products will require you to answer a validation question instead of entering a product key.)