| title | ISBN-13 | year of publication |
|---|---|---|
| Arthurian Figures of History and Legend: A Biographical Dictionary | 978-0-7864-4420-5 | 2010 |
| Historic Figures of the Arthurian Era: Authenticating the Enemies and Allies of Britain's | 978-0-7864-4509-7 | 2009 |
| Historic Figures of the Arthurian Era: Authenticating the Enemies and Allies of Britain's Post-Roman King | 978-0-7864-0648-7 | 2000 |
| The Historic King Arthur: Authenticating the Celtic Hero of Post-Roman Britain | 978-0-7864-0266-3 | 1996 |