Which book is the best-selling of all time?

No single book comes close to the Bible, with estimates of more than 5 billion copies printed and distributed over the centuries. The complete Bible has been translated into more than 700 languages, and portions of it into over 3,000. Quotations from Chairman Mao Zedong, the little red book of the Chinese Cultural Revolution, is often listed second, with estimates of around a billion copies. Among fiction, sales claims for classics like Don Quixote and A Tale of Two Cities run into the hundreds of millions but are hard to verify. The Harry Potter series by J.K. Rowling has sold more than 600 million copies, making it the best-selling book series in history.