Goetia

an interesting scientific backing to the idea of servitors comes with an understanding of holonomic conscious. also thought forms are a good supplementary study. As well as "The Sacred Magic of Abramelin the Mage" A piece of advice i got form someone which is very prudent is to use the goetia in the study of creating ones own servitors and refrain from the actual evocations in the book, for they have a malicious disposition.