At the top of my list:
1) Mike Summey and Roger Dawson - The Weekend Millionaire's Secret to Investing in Real Estate - this is the best book money can buy on rental properties.
2) T Harv Eker - Secrets of the Millionaire Mind - Think Rich to get Rich - this book will simply blow your mind.
3) James Rickards - Currency Wars , The death of Money and The new case for Gold - Straight from the insiders on what's going on in the world economy and how to protect yourself.
4) Dolf De Roos - RealE Estate Riches - This is the guy that show Robert Kiyosaki how to start.
5) Robert Kiyosaki - Well he is one of my rich dad's that helped me to get on the right track.