See also references for related subjects.
Charles-Edwards, T. M., “5. From Pelagius to Gildas”, in: Charles-Edwards, T. M., Wales and the Britons, 350–1064, History of Wales, Oxford: Oxford University Press, 2013. 192–219.
Dumville, David N., “Late-seventh- or eighth-century evidence of the British transmission of Pelagius”, Cambridge Medieval Celtic Studies 10 (Winter, 1985): 39–52.