Best books to study for LEED?

Bruce, Looks like you never got an answer to your question, I hope this didn't inhibit your desire to study!  I suggest using Everblue.edu for LEED GA and AP exam preparation (assuming you mean credential, not certification), its fairly easy to use and inexpensive and the test exams are very good.  The best book to study is the reference guide, but a LEED GA exam represents a body of knowledge that is far more general in nature.  Feel free to contact me, I have some material I can pass along, levi@viable-gbs.com