You'll need (reprints of) the original TM's and Parts Lists, and most of those can also be found online as PDF for free. Then I would say the books by John Farley and if you can find them the books by Lawrence Nabholtz. There are more, but these will give you a nice start.
Also, make sure you join and read the jeep forums of http://www.g503.com/ , the #1 jeep information resource world-wide...