G'day,

I can't really give you a reliable work on demons, because I have not found one yet. I try to approach the subject with as little bias as possible.

Solomon's Goetica is probably the most authentic.

There are many types of demons and most have a 'demonic form' including many with horns.

I have encountered many types in my life.

I agree, in that to get a handle on these one needs to put aside religious programming. This also applies to angels.

For a good take on the nature of demons, I recommend the book 'The Magus of Strovolos'

Robert