SAN FRANCISCO, CA--(Marketwired - May 8, 2014) - Keiretsu Forum announces the publishing of its Due Diligence Handbook in the Apple iBook store as a free resource for angel investors and entrepreneurs. As the world's largest private equity angel investment network, Keiretsu Forum provides a leading voice in developing best practices in conducting due diligence. The Due Diligence Handbook outlines the investment group's due diligence process and provides useful resources that support angel investors in their process of evaluating potential investments.