Books on Clairvoyance and psychic abilities?

[Joscha]

I don't know much about the occult but I am interested and want to learn some stuff about it. I was wondering if any of you have some books on cultivating clairvoyant and psychic abilities (for beginners). Or good occult books in this direction anyway.I've already heard of The keys of Perception by Ivo dominguez but I thought maybe there are some more good sources.