| UFOs: Interplanetary Visitors: A UFO Investigator Reports on the Facts, Fables, and Fantasies... | 1974 |
| Watchers: The Secret Design Behind UFO Abduction | 1990 |
| The Allagash Abductions: Undeniable Evidence of Alien Intervention | 1993 |
| The Andreasson Affair Phase Two: The Continuing Investigation of a Woman's Abduction by Alien Beings | 1994 |
| The Watchers II: Exploring UFOs and the Near-Death Experience | 1995 |
| The Andreasson Legacy | 1997 |
| The Melchizedek Connection | 2001 |