2. General: "RICOWI Best Practices Guides for Roofing - Single Ply Membrane" is available on the website of the Insurance Institute for Business & Home Safety. ("RICOWI" stands for the Roofing Industry Committee on Weather Issues).
3. Inspection: A decent general roof inspection and maintenance manual for low-slope roofs is available here at the Firestone Building Products website.
4. Technical: "Black vs. White Roofing" by Dean A. Rutila is worth taking a look at if you're trying to figure out what to put on your building. It's not as simple as it might seem. The article is from 2009, and archived at the Buildings.com website.