As you may have noticed, the recommended reading list can be pared down to primarily just four writers: Grant Morrison, Alan Moore, Warren Ellis, and Neil Gaiman. But there are odds and ends.
The Psychonaut Field Manual by Bluefluke
Mage Book One: The Hero Discovered, By Matt Wagner and Sam Keith
The Dream-Quest of Unknown Kadath, by H.P. Lovecraft and I. N. J Culbard
The Psychonaut Field Manual is an actual guide to practicing Chaos Magick. It may be the most beginner friendly introduction to Chaos Magick out there. Start here and much of the other so called beginner material.
The Hero Discovered is a great story and does a good job talking about archetypes. If you want to get a sense of how stories repeat and myths recur. There are later books, but we only recommend the first one.
The Dream Quest of the Unknown Kadath is, like The Hero Discovered, a great introduction to concepts that we use but little else talks about. H.P. Lovecraft was a terrible bigot, but his ideas about the unknown, the unknowability of the infinite, and the power of dreams are all useful. This piece is illustrated by I.N.J. Culbard. He has illustrated of Lovecraft work as well which the reader may also wish to explore.
Professor Harbinger's School for Villains 