| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Ancient Alien Artifacts: Visual History of Ancient Astronaut Research | 978-1-4565-2806-5 (1-4565-2806-8) | 2011 |
| Knowledge Apocalypse: Ancient Astronauts & The Search for Planet X | 978-1-4537-1947-3 (1-4537-1947-4) | 2011 |