Rankings reflect sales at almost 4,000 bookstores plus wholesalers serving 50,000 other retailers (gift shops, department stores, newsstands, supermarkets), statistically weighted to represent all such outlets nationwide.

Rankings reflect sales, for the week ended May 6, at almost 4,000 bookstores plus wholesalers serving 50,000 other retailers, statistically weighted to represent all such outlets nationwide.

The universe of print book dealers is well established, and sales of print titles are statistically weighted to represent all outlets nationwide.