Cynhafal

S. Baring-Gould and John Fisher The Lives of the British Saints (London: Honourable Society of Cymmrodorion, 1908), 254⁠–6    Darllen ar-lein

P.C. Bartrum Early Welsh Genealogical Tracts (Cardiff: University of Wales Press, 1966), 64

Elissa Henken Traditions of the Welsh Saints (Cambridge: D.S. Brewer, 1987), 274⁠–6

Rachel Bromwich (ed.) Trioedd Ynys Prydein (Cardiff: University of Wales Press, 2014, fourth edition), 325⁠–6