| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| A Dictionary of Cryptozoology | 978-0-9544936-1-5 | 2004 | |
| Book of Irish Names | 978-0-86281-247-8 | 1990 | Ida Grehan · P.W. Joyce |
| Further Cryptozoology | 978-0-9544936-8-4 | 2007 | |
| ILL ENCYCLOPEDIA ARTHURIAN LEGENDS | 978-1-84333-005-9 | 2002 | |
| Illustrated Encyclopedia of Arthurian Legends | 978-1-56619-876-9 | 1995 | |
| Irish First Names | 978-0-86281-962-0 | 2005 | |
| Sherlock Holmes and the Heir of Albion | 978-0-9544936-7-7 | 2007 | |
| The Encyclopaedia of Arthurian Legends | 978-1-85230-199-6 | 1991 | |
| The Mystery Animals of Ireland | 978-1-905723-59-1 | 2010 | Gary Cunningham |
| The Robin Hood Companion | 978-0-9544936-0-8 | 2003 | |
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