An addition directed particularly at cofounders: The Freelancer's Survival Guide by Kris Rusch. It is the single best book on entrepreneurship/running a small b

An addition directed particularly at cofounders: The Freelancer's Survival Guide by Kris Rusch. It is the single best book on entrepreneurship/running a small business I have ever read. It covers pretty much all the bases. It also covers an enormous number of the issues that you will inevitably encounter if you start a business, but likely have never experienced otherwise.