Those are two good books. I like Rich Dad, but some of the lessons are not for everyone.
I usually add Dale Carnegie's How to Win Friends and Influence People to my list. It's not necessarily a business book but it teaches some of the keys to building wealth. In today's world almost everything you have or use comes through other people. In order to make an abundant income you need to add value to people in some way, the more people you add value to the more you make.