The New York Times and Publishers Weekly maintain weekly paperback bestseller lists at nytimes.com and publishersweekly.com as of 2015. Each publication includes data from several paperback categories.
The New York Times lists include the top 10 bestsellers in paperback nonfiction and trade and mass-market paperback fiction. The New York Times bases their lists on sales reports from book vendors, including independent and chain bookstores, supermarkets, newsstands and entertainment retailers. Nielsen BookScan compiles the Publishers Weekly lists, which include the top 25 bestsellers in the trade and mass-market paperback categories. Publishers Weekly maintains an archive of past bestseller lists that is available to subscribers. The complete lists from both the New York Times and Publishers Weekly note the number of weeks each title has appeared on the list.