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

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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

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, 1988

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, 1987

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

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

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

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

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, 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

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