| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Secret Wars | 978-1-59102-149-0 | 2004 | |
| Spaceships of the Pleiades | 978-0-87975-959-9 | 1995 | |
| The Making of Bigfoot: The Inside Story | 978-1-59102-139-1 | 2004 | Greg Long |
| The Roswell UFO Crash: What They Don't Want You to Know | 978-0-440-23613-9 | 2000 | |
| The Roswell Ufo Crash: What They Don't Want You to Know | 978-1-57392-127-5 | 1997 | |