| title | ISBN-13 | year of publication |
|---|---|---|
| Chinook Crash: the Crash of Raf Chinook Helicopter Zd576 on the Mull of Kintyre | 978-1-84415-074-8 | 2004 |
| The Loch Ness Monster: The Evidence | 978-1-84158-198-9 | 2002 |
| The Loch Ness Monster: The Evidence | 978-1-874744-61-0 | 2001 |
| The Loch Ness Monster: The Evidence | 978-1-57392-178-7 | 1997 |
| The Loch Ness Monster: The Evidence | 978-0-08-041197-2 | 1991 |
| The Rise and Fall of Jesus: The Ultimate Explanation for the Origin of Christianity | 978-0-9521512-1-0 | 1996 |
| The UFO Mystery Solved: An Examination of UFO Reports and Their Explanation | 978-0-9521512-0-3 | 1994 |
Birlinn Ltd · Explicit Books · Pergamon Press · Prometheus