If you are too poor to buy a lucid dreaming book, no need to worry. The Internet offers quite a generous selection of online books about lucid dreaming:
The Art of Lucid Dreaming: A Manual, Carolus den Blanken (English Version)
Exploring the World of Lucid Dreaming, Steven LaBarge (Yes, the whole book online!)
A Course on Consciousness, Ian Wilson (A good bit about lucid dreaming in here)
Senoi Dream Theory: Myth, Scientific Method, and the Dreamwork Movement, G. William Domhoff (Lucid Dreaming Mentioned quite a bit)
Bewilderness, Palyne "PJ" Gaenir (An autobiographical exploration of some of the author's exceptional experiences with consciousness. Lucid dreams are mentioned frequently).
Traveling: An Accidental Expert's How-To Leave Your Body Handbook, Alan Guiden
