Lucid Books, Recommended

The Phase

Michael Raduga is the founder of the Phase Research Center. He researches a dissociative state of mind (the phase) commonly referred to as out-of-body experiences (OBEs), astral projections and lucid dreams. M.Raduga the author of more than 10 books published on this topic. He is a leading researcher on methods that allow every person to achieve out-of-body experiences within a very short period of time. Meanwhile, M.Raduga approaches the matter in a scientific and no-nonsense way.

A little outdated, Free version of this book is available here.