Baring-Gould, Sabine; Fisher, John (1911). The Lives of the British Saints, Volume 2. London: The Honourable Society of the Cymmrodorion. p. 326. Retrieved 21 April 2015.
Baring-Gould, Sabine; Fisher, John (1911). The Lives of the British Saints, Volume 4. London: The Honourable Society of the Cymmrodorion. p. 298. Retrieved 21 April 2015.
Baring-Gould, Sabine; Fisher, John (1911). The Lives of the British Saints, Volume 2. London: The Honourable Society of the Cymmrodorion. p. 385. Retrieved 21 April 2015.