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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

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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, 1987

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

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