I have been doing a LOT of reading. Unfortunately I am not too pleased with most of it.

• The Book of the Law by Aleister Crowley- OK, well, been there, read that, guess I had to at some point. That sure was a book, and also a thing that exists, and you can read it with your eyeballs if you feel like it. 
• Witchcraft and the Gay Counterculture by Arthur Evans- I really wanted to like it, but it made me shriek with uncontrollable rage. If you like soft polytheism and historical inaccuracies, you’ll love this. 
• I, Lucifer by some dude straight up named Corvis Nocturnum– Don’t buy this, please don’t. There are pretty pictures but it’s the most poorly written thing I have encountered this side of “The Eye of Argon.” I don’t think there was an editor. It is possible there wasn’t even a second draft. There may not have even been spellcheck.

Some better reads:

• The Devil’s Bride by Martin Ebon- a neat little book about exorcism from a psychological stand point– particularly about demonic possession and exorcism as a cathartic ritual which leads to emotional healing. Reads as fairly skeptical but is surprisingly open-minded about ESP and psychokinesis. But not demons. OK! We all have our biases, I guess. Anyway, it’s a fun read, but by no means essential.
• A Dictionary of Angels Including the Fallen Angels by Gustav Davidson- What it says on the tin. Shouldn’t be your only source but if you happen to find yourself wondering who the fuck Cabiel is this probably beats Wikipedia for a first stop. Nicely cited and will lead you straight to better sources.