July 2010 popularity index of Best GMAT Books as determined by GMAT Club members. (We measured how often our members referred to each of the books in their posts from the past month and assembled the GMAT Book popularity index below). You can also visit this thread for details: https://gmatclub.com/forum/top-20-best-gmat-books-on-gmat-club-76582.html
You are also welcome to browse our reviews and recommendations of Best GMAT Books (all-in-one), GMAT Quant Books, and GMAT Verbal books.