never use this bookstore!! they did not have the book needed 01/25/10 talked into buying a disk lab pack, told is was better than the book.will not work w/ my computer never opened. less than 24 hours tried to return for refund on visa card was told 01/21/10 was the last day for a full refund. i could get half my money back but not all because the last day for full refund was 01/21/10 but the purchase was 01/25/10. the man was very rude!