Frog Books · Souvenir Press Ltd
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| The Deepening Complexity of Crop Circles: Scientific Research and Urban Legends | 978-0-285-63625-5 (0-285-63625-1) | 2001 |
| The Deepening Complexity of Crop Circles: Scientific Research and Urban Legends | 978-1-58394-046-4 (1-58394-046-4) | 2001 |