Ratings for the hard-cover lists are based on computer-processed sales figures from 2,000 bookstores in every region of the country, statistically adjusted to represent sales in all bookstores.

These listings are based on computer-processed sales figures from 3,050 bookstores and from representative wholesalers with more than 28,000 other retail outlets, including variety stores and supermarkets.

The list is based on computer-processed sales figures from 2,000 bookstores and from representative wholesalers.

The listings above are based on computer-processed sales figures from 2,000 bookstores in every region of the United States, statistically adjusted to represent sales in all bookstores.

The paperback listings also include computer-processed sales figures from representative wholesalers serving more than 40,000 retail outlets.