The Dictionary of Demons: Names of the Damned
A Dictionary of Angels: Including the Fallen Angels
The Black Arts: A Concise History of Witchcraft, Demonology, Astrology, and Other Mystical Practices Throughout the Ages (Perigee)
Grimorium Verum
The Encyclopedia of Angels, Second Edition
The Encyclopedia of Ghosts and Spirits
Encyclopedia of Spirits: The Ultimate Guide to the Magic of Saints, Angels, Fairies, Demons, and Ghosts
Uncle Setnakt's Essential Guide to the Left Hand Path
The Encyclopedia of Witches, Witchcraft and Wicca
The Exorcist's Handbook