What books would you get for your contractor?

[Brock Salgado]

Not sure if this is a strange question or not but it certainly is not one I've seen or heard answered. My buddies and I have a contractor that is outstanding. He's honest, willing to teach us a great deal about what he does, and actively searches for ways to achieve our vision with our flips and also to save us money. This is both because of his character and because it is pragmatic: we both intend to do plenty of business with one another over the next few years. I see some things in his business structure, however, that lead me to believe he could be doing better in terms of the general business admin and strategic planning that my partners and I have begun to learn about as we build and grow our own business. I've seen many books about agents, investors, syndicators, etc. but not so much about how to succeed as a contractor, specifically. All this to ask the question: What books or resources have y'all given to your contractors to build their businesses? Any thoughts or advice on growing with your contractor and developing one another would be of great value.