This article is from the Radio Control (R/C) Flying FAQ, by Shamim Mohamed firstname.lastname@example.org with numerous contributions by others.
There are two excellent books. Paul Tradelius's book (available through
Model Airplane News) is particularly good for beginners. He presents the
material in an order and a depth that is well suited to getting started. A
more encyclopedic book is the one by Ray Hostetler. This book goes into
great detail on all topics, and is a book to grow into. Ray's book mixes
beginner info and info necessary only for advanced pilots, and consequently
can be a bit overwhelming at first. There's a lot of stuff in there that
you won't need to delve into for quite a while. I would recommend getting
both of these books.