カヴァス
M.Dent): p. 80-113, ISBN 0-460-87297-4 (Revised edition 1993; Indexed 1989; first published Everyman Library 1949))
Bromwich, Rachel; Evans, Daniel Simon (1992) (snippet), Culhwch and Olwen: an edition and study of the oldest Arthurian tale, University of Wales Press, https://books.google.co.jp/books?id=zzkcAQAAIAAJ
Rhys, John (1901) (google), Celtic folklore: Welsh and Manx, 2, pp. 520-2; 537-9, https://books.google.co.jp/books?id=ASXaAAAAMAAJ&pg=PA537