ブリトン人の歴史
(1925), “Nennius the author of the Historia Brittonum” (preview), Essays in Medieval History presented to T. F. Tout (Manchester), https://books.google.co.jp/books?id=EjKg3UoCJeIC&pg=PA25
Green, Thomas (2007). Concepts of Arthur. Stroud, Gloucestershire: Tempus. ISBN 978-0-7524-4461-1.
Higham, N.J. (2002), King Arthur: Myth Making and History, London: Routledge & Kegan Paul
Bromwich, Rachel (2006). Trioedd Ynys Prydein: The Triads of the Island of Britain. University Of Wales Press. ISBN 0-7083-1386-8.