With the understanding that the definition of a book is difficult; data is often impossible to confirm; that religious books like the Bible and Qur’an will be excluded; and that this list is not exhaustive, complete, or even a "top 10," these are candidates for some of the best-selling books in history.
See #^http://mentalfloss.com/article/587211/best-selling-books-history
#reading
#^10 of the Best-Selling Books in History (Minus Religious Texts)
From Mao to Harry Potter to Betty Crocker, these are 10 candidates for some of the best-selling books in history.