a. D. · A. Davidson · D. Davidson · Dan and Dave Davidson
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Energy: Breakthroughs to New Free Energy Devices History and Current Status of Developed Free Energy Devices | 978-0-9626321-0-5 (0-9626321-0-4) | 1989 |
| Shape Power | 978-0-9626321-5-0 (0-9626321-5-5) | 1997 |