Approach the Goetic demons as maps of the mind, not as self empowered entities but as a guide to illustrating and identifying the problems at hand.
The Goetia is the first book of the 17th century grimoire, The Lesser Key of Solomon, which was translated into English by SL MacGregor Mathers in 1904 and later used extensively by Aleister Crowley. The Goetia provides a catalog of 72 demons that can be summoned to do one's bidding. Read articles about the Goetia below.
I talk about 3 traditions for communicating with demons on this site: The Faust myth, Black Magick grimoires, and Goetic magick.
From a reader: A spiritualist talks about various voodoo deities and demons and their sources.
Zepar is the 16th spirit, a great Duke, who causes women to fall in love with men.
Zagon is the 61st spirit, a great King and President, who appears in the form of a bull with gryphon wings.