Adamant Media Corporation · Isha Books
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A Welsh Grammar for SchoolsBased on the Principles and Requirements | 978-93-331-2594-9 (93-331-2594-9) | 2013 |
| Celtic Religion in Pre-Christian Times | 978-1-4021-0010-9 (1-4021-0010-8) | 2005 |