P1042 Bibliography: p.522-533. - Includes indexes.
P1073 Testun Cymraeg, cyflwyniad, cyfieithiad ac esboniad yn Saesneg = Welsh text, English introduction, translation and commentary.
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Trioedd Ynys Prydein = The triads of the island of Britain. ISBN 0708313868. Published by University of Wales Press in 2006. Publication and catalogue information, links to buy online and reader comments.