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Boyd 2017. Boyd, Matthieu (3 August 2017), "Cynfeirdd", in Rouse, Robert; Echard, Sian; Fulton, Helen; Rector, Geoff (eds.), The Encyclopedia of Medieval Literature in Britain, Oxford, UK: John Wiley & Sons, Ltd, pp. 1–2, doi:10.1002/9781118396957.wbemlb647, ISBN978-1-118-39695-7, retrieved 7 October 2022