Jafrez Menoe : diforc'h etre ar stummoù

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* ''Y Bywgraffiadur Cymreig hyd 1940'' (Anrhydeddus Gymdeithas y Cymmrodorion, 1953)

* Geoffrey of Monmouth. ''The History of the Kings of Britain.'' Translated, with introduction and index, by Lewis Thorpe. Penguin Books: London, 1966. ISBN 0-14-044170-0