The Excellent 11. My magical hat goes off to the absolute greatest of occult authors and teams of authors. They taught me a lot of occult concepts. These books are by far the greatest that I have encountered in my 30+ years of research. The following list is not in order of importance, but rather alphabetical by author/team, and the book that is one of the greatest by the author/team.
1.Ted Andrews: Simplified Qabala Magic
2.Geof Gray-Cobb, Maiya Gray-Cobb: Miracle of New Avatar Power, Twist Your Fate, The Mystic Grimoire of Mighty Spells and Rituals (under his anonymous name Frater Malak), Secrets from Beyond the Pyramids, Acupinelogy, Angels - The Guardians of Your Destiny
3.David Conway: Complete Magic Primer
4.Patrick Dunn: Postmodern Magic: The Art of Magic in the Information Age
5.Nick Farrell: Making Talismans: Living Entities of Power
6.Gavin Frost, Yvonne Frost: The Witch's Book of Magical Ritual, the Witch's Magical Handbook, Power Secrets From a Sorcerer's Private Magnum Arcanum
7.David Godwin: Godwin's Cabalistic Encyclopedia
8.Francis King, Stephen Skinner: Techniques of High Magic: A Handbook of Divination, Alchemy, and the Evocation of Spirits
9.Israel Regardie (and Marc Allen): The Art of True Healing
10.Donald Tyson: The Magician's Workbook: Practicing the Rituals of the Western Tradition
11.Frater U.D.: High Magic: Theory & Practice
If you are out to purchase any of these be sure to check all the possibilities. Check on-line with all the bookstores because there may be an ebook for less price if you have a digital reader.