Mastering Witchcraft by Paul Huson
Book of Fallen Angels by Mike Howard Ecstascies
Deciphering the Witches Sabbath and Night Battles by Carlo Ginzburg
The Book of Jubilees
The Book of Enoch
Bonus: online articles by Andrew Chumbley, the Leaper in Between and What is Traditional Witchcraft?
Also books about Cunning People by Emma Wilby and Owen Davies will aid you in understanding this craft.
Books by Austin Osman Spare, many of which are available and past copyright on Scribd: http://www.scribd.com/search?query=austin+osman+spare