School of Welsh
- 2012
Agweddau ar ryddiaith Owen Martell
Evans, R. L. (Author), Price, A. (Supervisor), 2012Student thesis: Doctor of Philosophy
- 2007
Dechreuadau a gweithgarwch cynnar John Jones (Myrddin Fardd)
Efans, N. (Author), 2007Student thesis: Doctor of Philosophy
- 2006
- 2004
Geirfa Gymraeg Sir Fflint
Wynne, G. (Author), Thomas, G. (Supervisor), 2004Student thesis: Doctor of Philosophy
- 2001
Diwylliant ar waith: astudiaethau gwerin o Gymru
Gwyndaf, R. (Author), Jarvis, B. (Supervisor) & Thomas, G. (Supervisor), 2001Student thesis: Doctor of Philosophy