| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Christmas Bells: Carols in Welsh and English | 978-0-900426-00-1 (0-900426-00-4) | T.G. Jones | |
| Welsh National Music and Dance | 978-0-900426-01-8 (0-900426-01-2) | 1971 | |
G. W. · G. Williams · S. G. · S. W. · S. Williams · W G · W.S. · W.W. · W. Williams