Looking for a book on Astral Projection.?

Hello. About a year ago, I read my first book on astral projection, and it got me into the occult. I have since then deleted it, but now regret this, as I feel I am missing a part of myself. I need it back, or at least the name of it, since I can't remember the name. I can remember one page describing the lower astral planes, where the author sees two hooded figures run past him, and another one where he goes to the higher planes and encounters an elf. He also talked about the void quite a bit. I believe the author had a Hispanic name, but I can't be certain.