Here's a list of Top GMAT Club books of July:
You can find other month's Top GMAT Club Books here.
August 2009: https://gmatclub.com/blog/2009/08/20-most-popular-gmat-books-from-gmat-club/
March 2009: https://gmatclub.com/blog/2009/04/march-2009-top-20-gmat-books-ranked-by-popularity-on-gmat-club/
[…] Lists: August 2009: http://gmatclub.com/blog/2009/08/20-most-popular-gmat-books-from-gmat-club/ March 2009: […]
November 2009: http://gmatclub.com/blog/2009/12/best-gmat-books-for-november-2009-as-voted-by-gmat-club-members/