I thought I was purchasing the book, from these people. Instead what I received was a two page pamphlet. Inside was instructions on how to download a book, and it is only good for a semester. Couldn't use it. I needed a "Book". I thought it would be easy to get my money back. Right.? No. Only a third of it. Never activated it. They haven't lost a dime on it, but they kept my money. A broke Pysics Major. Never ever ever do business with these people. I had to swallow the 140 loss, and spend another 210.00 on a real book elsewhere