I'm going to disagree about "Lesser key of Solomon", is something you should search up. Lesser Key of Solom has many wrong information about Demons and I've heard the way it shows to summon them..they wouldn't take it very nicely. It is said by many, that Demons hate summoning circles, of any kind, and many people are against using this book's way of summonings.
I may be able to help you into that. You can mail me anytime.