Seiriol
Darllen ychwanegol
S. Baring-Gould and John Fisher The Lives of the British Saints (London: Honourable Society of Cymmrodorion, 1913), 177â –80 Darllen ar-lein
David Farmer The Oxford Dictionary of Saints (Oxford: Oxford University Press, 2011), 392
Elissa Henken Traditions of the Welsh Saints (Cambridge: D.S. Brewer, 1987), 238â –9, 363
David E. Thornton 'Seiriol [St Seiriol] (fl. 6th cent.)' yn Oxford Dictionary of National Biography (Oxford: Oxford University Press, 2004) Darllen ar-lein
