Lluniau Rene Magrer o Épona, plat 44, Delmas 1953, France; P. R. I. A xxxviii Section C plât v; 'Fig 31 The design on the pattern stone, Bryn Celli Ddu', o The Prehistoric Chambered Tombs of England and Wales, Prof. Glyn E. Daniel, (Cambridge University Press, 1950), t. 116. After Grimes Archaeology, 1930, xlix; plât gyferbyn â thudalen 12 o Dark Age Britain, gol. D. B. Harsen, 1956; 'Distribution of ogam-inscribed stones in the British Isles' gwnaed gan Prof. R. A. S. Macalister, o lyfr Cyril Fox, Personality of Britain, t. 36; a chalendar o T. G. H. Powell, 'The Celts', plât 76.