His books are published in more than 50 countries and adopted at several universities .
He is the author of more than 20 titles and is the decade 's biggest seller in Brazil , where 12 million books have been sold .
author 's books are published in more than 50 countries and adopted at several universities .
He is the author of more than 20 titles and is the decade 's biggest seller in Brazil , where 12 million books have been sold .