1. 2007
2. Dechreuadau a gweithgarwch cynnar John Jones (Myrddin Fardd)

   Efans, N. (Author), 2007

   Student thesis: Doctor of Philosophy

3. 2001
4. Diwylliant ar waith: astudiaethau gwerin o Gymru

   Gwyndaf, R. (Author), Jarvis, B. (Supervisor) & Thomas, G. (Supervisor), 2001

   Student thesis: Doctor of Philosophy