An ISBN is a unique number assigned to every specific textbook. The ISBN is different if the book is hardcover or paperback and changes with each version and edition. Getting the exact, correct textbook is important, and there are several ways we have found for you to do this.
Finding an ISBN on your textbook
There are two places to look for figuring out your ISBN. The first place, is on the back cover of your textbook (below image). The ISBN will either be 13 or 9 digits. If you can't find it (or the bookstore deliberately obscured it), the ISBN will also be in the front few pages - usually on the copyright information pages - of your textbook.
Buying a textbook - where is your ISBN
First, Book.Defy wants to help you by working with your professor. With just a few minutes of effort, professors can add in the textbook for the course you are taking, and put in all of the necessary numbers - and even select whether they will allow for "older" editions to be used. This way, you know you are exchanging for the right textbook on Book.Defy.
If your professor doesn't want to cooperate, and wants to make money on that new edition he's making you lug around for a semester, there are other ways. The first is that you can go to your bookstore's website. Many times, they will include the ISBN number right beneath the overpriced monstrocity that you will have to purchase to make it through your semester. If you University uses Barnes and Noble, (anything.bncollege.com), the ISBN for your textbook appears on that website. From there, just take that ISBN and plug it into Book.Defy to see if anyone else is exchanging textbooks.
