| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Historic Figures of the Arthurian Era: Authenticating the Enemies and Allies of Britian's Post-Roman King | 978-0-7864-0648-7 (0-7864-0648-8) | 2000 |
| The Historic King Arthur: Authenticating the Celtic Hero of Post-Roman Britain | 978-0-7864-0266-3 (0-7864-0266-0) | 1996 |