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Ingham, R. The Persistence of Anglo-Norman 1230-1362: A Linguistic Perspective, ...
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Ingham, R. The Persistence of Anglo-Norman 1230-1362: A Linguistic Perspective, in J. Wogan-Browne (ed) Language and Culture in Medieval Britain: the French of England, c1100-c1500. York: (2009), pp.44-54, and cited in Penman, Michael. Robert the Bruce. New Haven: Yale University Press (2018), pp. 16, 340 fn 21.