| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Resentment Against Achievement | Hardcover | 978-0-87975-447-1 | 1988 |
| The Making of the Messiah | " | 978-0-87975-691-8 | 1991 |
| The Ufo Verdict: Examining the Evidence | Paperback | 978-0-87975-338-2 | 1986 |
| The Ufo Verdict: Examining the Evidence | Hardcover | 978-0-87975-146-3 | 1981 |
| UFO Sightings: The Evidence | " | 978-1-57392-213-5 | 1998 |