A great book or source for duplex, triplex, and fourplex investing?

[David Thomas]

I am a young investor (in my 20's). I do not currently have my license but have completed classes and am awaiting exam and subsequent licensing. I am currently reading Tom Hopkins's Mastering the Art of Selling Real Estate. I actually find this to be a very nice read and down-to-earth. It's a good pick-me-up when I feel dumb relative to agents in my office who have conducted multiple transactions and have a good rapport and manner on the phone and with their clients. Seeing as I do not have clients yet, I am trying to attain as much information as possible until I am licensed.

Aside from the licensing, I am very interested in multifamily home investing. I have almost $7500 saved up in 4 months (before taxes, working on self-employed 1099 basis). While that would be a solid start if I was investing in other parts of the country, I live in Silicon Valley/Bay Area and the prices of any property are fairly steep so I am trying to learn techniques on investing with large financing/small upfront expenditures.

If anyone knows of some solid techniques or advice, or even a great book/read/article on MFH investing ... I would love to know. I love BiggerPockets forums and read constantly, and highly respect the wealth of knowledge amount the agents/investors/etc here.

Thank you for your time!