ISBN 1-85500-059-8===Secondary sources===*Ford, Patrick K. "Branwen: A Study of the Celtic Affinities," "Studia Celtica" 22/23 (1987/1988): 29-35.
ISBN 1-85500-059-8* Ford, Patrick K. "Branwen: A Study of the Celtic Affinities, " "Studia Celtica" 22/23 (1987/1988): 29-35.