| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| The Presidents and UFOs: A Secret History from FDR to Obama | Paperback | 978-1-250-09164-2 (1-250-09164-0) | 2016 |
| The Presidents and UFOs: A Secret History from FDR to Obama | Hardcover | 978-1-250-04051-0 (1-250-04051-5) | 2015 |
| UfoLeaks. I documenti segreti della Casa Bianca da Roosevelt a Obama | Copertina flessibile | 978-88-566-4213-1 (88-566-4213-1) | 2015 |