Degfan

The Place-names of Pembrokeshire (Aberystwyth: National Library of Wales, 1992), 712

Wales and the Britons 350–1064 (Oxford: Oxford University Press, 2013), 596–7

'The Church of S. Decuman, Rhoscrowther' yn Archaeologia Cambrensis (1915)

Parochiale Anglicanum (London: 1733), 178

Thesaurus Rerum Ecclesiasticarum (London: 1754), 458

'Parochiale Wallicanum' yn Y Cymmrodor (1910), 32