Rich Dad, Poor Dad by Robert Kiyosaki

About Cash Flow...And 33 Other Key FInancial Measures: Guidelines, Formulas, and Rules of Thumb for Making Money in Real Estate by Frank  Gallinelli

The ABC's of Real Estate Investing ( Rich Dad's Advisor Series): The Secret of Finding Hidden Profits Most Investors Miss by Ken McElroy, a Robert Kiyosaki series

The Tax-Free Exchange Loophole: How Real Estate Investors Can Profit from the 1031 Exchange
Jack Cummings

Multiple Streams of Income
Robert G. Allen