| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Chasing Graveyard Ghosts: Investigations of Haunted & Hallowed Ground | 978-0-7387-2126-2 (0-7387-2126-3) | 2011 |
| Ghost Worlds: A Guide to Poltergeists, Portals, Ecto-Mist, & Spirit Behavior | 978-0-7387-1195-9 (0-7387-1195-0) | 2007 |