This book is a little outdated (1990) and is pretty much designed for someone who just learned the word "hydroponics". If you are reading this, you know too much. To be quite honest, you would learn more from YouTube Videos. Let me know if you know good hydroponics books. I'm coming up empty and the folks in the stores are pretty unhelpful. :P
A very cursory introduction to hydroponic gardening. Nicholls provides the necessary background, a handful of set-up schematics, a couple nutrient formulas, and other information necessary to start from scratch. The appendix is very useful, giving a list of other texts, as well as suppliers for anything one might need (although this list is probably a bit dated.)
An interesting introduction to hydroponics. It provides the basics and has tables near the back which describe some of the problems and the cure for them.