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Barr, Helen. Signes and Sothe: Language in the Piers Plowman Tradition. D.S. Brewer, 1994.
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Griffiths, Lavinia. Personification in Piers Plowman. Brewer, 1985.
Hanna, Ralph. London Literature, 1300-1380. Cambridge University Press, 2005, http://0-dx.doi.org.pugwash.lib.warwick.ac.uk/10.1017/CBO9780511483318.
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Hoccleve, Thomas, 1370?-1450? ‘My Compleinte’ and Other Poems. Annotated ed, University of Exeter Press, 2001.
Hudson, A. ‘Epistola Sathanae Ad Cleros’. Selections from English Wycliffite Writings, Cambridge University Press, 1978, pp. 89–93, https://contentstore.cla.co.uk/secure/link?id=fc44ad8b-ef64-e811-80cd-005056af4099.
Hudson, Anne. ‘Langland and Lollardy’. Yearbook of Langland Studies, vol. 17, pp. 93–105, https://contentstore.cla.co.uk/secure/link?id=a18015ca-60af-e811-80cd-005056af4099.
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---. Piers Plowman: Critical Approaches. Methuen, 1969.
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Richard the Redeless and Mum and the Sothsegger | Robbins Library Digital Projects. http://d.lib.rochester.edu/teams/publication/dean-richard-the-redeless-and-mum-and-the-sothsegger.
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Watson, Nicholas. ‘Visions of Inclusion’. Journal of Medieval and Early Modern Studies, vol. 27, 1997, pp. 145–87, https://contentstore.cla.co.uk/secure/link?id=59458ef4-3aa1-e811-80cd-005056af4099.
Wood, Sarah Joy. Conscience and the Composition of Piers Plowman. electronic resource, Oxford University Press, 2012, http://0-doi.org.pugwash.lib.warwick.ac.uk/10.1093/acprof:oso/9780199653768.001.0001.