D,. H.. · D. Harms · Daniel H. · Daniel Harms and John Wisdom Gonce III
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Encyclopedia Cthulhiana | 978-1-56882-039-2 | 1994 | |
| Encyclopedia Cthulhiana: A Guide to Lovecraftian Horror | 978-1-56882-169-6 | 2003 | |
| Necronomicon Files: The Truth Behind Lovecraft's Legend | 978-1-57863-269-5 | 2003 | John Wisdom, III Gonce |
| The Book of Oberon: A Sourcebook of Elizabethan Magic | 978-0-7387-4334-9 | 2015 | James R. Clark · Joseph H. Peterson |
| The Cthulhu Mythos Encyclopedia | 978-1-934501-05-4 | 2008 | |
| The Encyclopedia Cthulhiana: A Guide to Lovecraftian Horror | 978-1-56882-119-1 | 1998 | |
| The Long-Lost Friend: A 19th Century American Grimoire | 978-0-7387-3254-1 | 2012 | |
| The Necronomicon Files | 978-1-892389-00-8 | 1998 | John Wisdom Gonce |
Chaosium · Elder Signs Press · Llewellyn Publications · Night Shade · Weiser Books