University of Wales. Board of Celtic Studies, Iorwerth Fynglwyd, Rowlands, Eurys Ionor, Jones, Howell Llewellyn, 1975

University of Wales. Board of Celtic Studies, Jones, Islwyn, Cilan, Hywel, 1963

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1987

University of Wales. Board of Celtic Studies, Rhygyfarch, 1056-1099, James, J. W. (John Williams), 1967

University of Wales. Board of Celtic Studies, Richter, Michael, 1943-, Giraldus, Cambrensis, 1146-1223, Lefèvre, Yves, Huygens, R. B. C., Dawson, Brian, Huygens, R. B. C. (Robert Burchard Constantijn), 1931-, Dawson, Brian, 1943-, 1974

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1991

University of Wales. Board of Celtic Studies, Ford, Patrick K., 1992

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1988

University of Wales. Board of Celtic Studies, Evans, D. Simon (Daniel Simon), 1921-, 1977

University of Wales. Board of Celtic Studies, Morris-Jones, Huw, University of Wales. Pwyllgor Termau Technegol, 1976

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1987

University of Wales. Board of Celtic Studies, Jones, Islwyn, Cilan, Hywel, 1963

University of Wales. Board of Celtic Studies, Richter, Michael, 1943-, Giraldus, Cambrensis, 1146-1223, Lefèvre, Yves, Huygens, R. B. C., Dawson, Brian, Huygens, R. B. C. (Robert Burchard Constantijn), 1931-, Dawson, Brian, 1943-, 1974

University of Wales. Board of Celtic Studies, Iorwerth Fynglwyd, Rowlands, Eurys Ionor, Jones, Howell Llewellyn, 1975

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1991

University of Wales. Board of Celtic Studies, Morris-Jones, Huw, University of Wales. Pwyllgor Termau Technegol, 1976

University of Wales. Board of Celtic Studies, Rhygyfarch, 1056-1099, James, J. W. (John Williams), 1967

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1988

University of Wales. Board of Celtic Studies, Evans, D. Simon (Daniel Simon), 1921-, 1977

University of Wales. Board of Celtic Studies, Ford, Patrick K., 1992

University of Wales. Board of Celtic Studies, Rhygyfarch, 1056-1099, James, J. W. (John Williams), 1967

University of Wales. Board of Celtic Studies, Evans, D. Simon (Daniel Simon), 1921-, 1977

University of Wales. Board of Celtic Studies, Richter, Michael, 1943-, Giraldus, Cambrensis, 1146-1223, Lefèvre, Yves, Huygens, R. B. C., Dawson, Brian, Huygens, R. B. C. (Robert Burchard Constantijn), 1931-, Dawson, Brian, 1943-, 1974

University of Wales. Board of Celtic Studies, Iorwerth Fynglwyd, Rowlands, Eurys Ionor, Jones, Howell Llewellyn, 1975

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1988

University of Wales. Board of Celtic Studies, Jones, Islwyn, Cilan, Hywel, 1963

University of Wales. Board of Celtic Studies, Ford, Patrick K., 1992

University of Wales. Board of Celtic Studies, Morris-Jones, Huw, University of Wales. Pwyllgor Termau Technegol, 1976

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1987

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1991