The Post compiles its bestsellers lists by combining hard cover, paperback and ebook sales data from NPD Book and Amazon.com — including qualified borrows of books read through Amazon's digital subscription program. The Post excludes non-narrative books at its sole discretion.
Amazon Most Read lists rank titles by the average number of daily Kindle readers and Audible listeners each week. Categories not ranked on Most Read charts include dictionaries, encyclopedias, religious texts, daily devotionals and calendars. All data is supplied by Amazon Charts and not edited by The Washington Post. The Post has no editorial influence on these lists.