The Real Estate Wholesaling Bible: The Fastest, Easiest Way to Get Started in Real Estate Investing
Real Estate Investing: How to Find Cash Buyers and Motivated Sellers by William Johnson
My Life & 1,000 Houses – 200+ Ways to Find Bargain Properties by Mitch Stephen
The books J Scott wrote you can find here on BiggerPockets, The Book on Flipping Houses and The Book on Estimating Rehab Costs. The way I see it, these books are full of the information cash buyers would want you to know since you're providing a service to them to save them time. After all, that is your role as a wholesaler.