Violet M. Firth (Dion Fortune) 
Applied Magic [EPUB ebook] 

Existence is beyond what our five senses perceive, and everyone can access the invisible planes of existence to come into harmony with the great Cosmic Forces. The renowned English magic expert accompanies this fundamental principle of hers with explanations on how to get out of the material plane, who the disembodied spirits, elementals and angels are, how to defend oneself against black magic, how to create a magical personality, what astral travel entails and many other topics.