This is one of the worst companies I have ever dealt with. Not only did the send me a book with a different ISBN than the one that I paid for, when I asked to be reimbursed the difference, almost $25 they said that I could send the book back to them for a refund but that I would have to pay for the shipping. This piece of $#*! company doesn't know how to do anything properly. Honestly I would much rather spend the $300 dollars extra that the text book costs than deal with these incompetent people again.