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B. Yorke, art. Cynegils, in Oxford Dictionary of National Biography, Oxford, 2004. (digitale versie[dode link] – betalend)
web.archive.org
Waarschijnlijk iets later, zie: D.P. Kirby, The Earliest English Kings, Londen - New York, 20002, p. 68. Gearchiveerd op 10 juni 2023.
B. Yorke, art. Cenwalh, in Oxford Dictionary of National Biography, Oxford, 2004. (digitale versie – betalend)
B. Yorke, Kings and Kingdoms of early Anglo-Saxon England, Londen - New York, 2002, p. 144. Gearchiveerd op 10 juni 2023.
B. Yorke, Kings and Kingdoms of early Anglo-Saxon England, Londen - New York, 2002, pp. 143-146. Gearchiveerd op 10 juni 2023.
Eddius Stephanus, Vita Sancti Wilfrithi 7 (= B. Colgrave (ed.), Eddius Stephanus. Vita Wilfredi, Cambridge, 1927, pp. 16-17). Gearchiveerd op 10 juni 2023.