The Greatest Books of All Time, As Voted by 125 Famous Authors 

“Of the 544 separate titles selected, each is assigned a reverse-order point value based on the number position at which it appears on any list — so, a book that tops a list at number one receives 10 points, and a book that graces the bottom, at number ten, receives 1 point.”

 

Source: The Greatest Books of All Time, As Voted by 125 Famous Authors – Brain Pickings