Despite the fear that fewer and fewer youngsters are reading, some books still continue to sell and win over new generations of readers. The books in this list have been especially successful around the world. It has also been claimed that religious texts such as the Bible and Quran, as well as some political texts may have all sold over 1 billion copies. But as many are usually distributed free of charge, sales are almost impossible to track. Moreover, since some of these books were published many years ago, the numbers are mere estimates and could be higher! Here are a few books considered as some of the top selling books of all time according to various sources including Forbes. So how many have you read?