4. Guinness World Records (2003) – 94 Million
By various authors before flooding the internet
First published in 1955, the Guinness World Records has been published in yearly basis. This book has been a repository of world heroics from all sorts of fields such as sports, freaky human deformities and eccentric feats among many others. The idea of having this book came to be when the boss of the Guinness brewery company wanted to know what the fastest game bird in Europe looked like, and later on thought of an idea of a book containing similar facts. The fact that this book is full of facts and interesting photos has made this book so demanding and since then about 94 million copies have been sold making the Guinness book of world records one of the best selling books of all time.