Any good Sub2 Books?

I am an investor in Illinois.
I own 2 duplexes and a single family home with mortgages funded mostly by Grandma’s trust fund.
That fund is out of money to loan me. I have the ability to get regular loans, but I’d rather save my cash. I work a full-time job, and would like to aquire properties to allow a modest early retirement.
I’d like to learn to do no-money down aquisitions like a sub-2.

Rather than ask a bunch of stupid questions, is there a good book or comprehensive resource I should get?

John $Cash$ Locke is a moderator on here and has a course that has good reviews. It’s called Sub-2, that’s what I do (I believe).

William Tingle

Wendy Patton has a good book on Subject To as well:

http://www.amazon.com/dp/047171836X/