Joan Beaufort, countess of Westmorland, Ownership Possible (c.1425-?) by Coat of Arms.
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Cavanaugh, Susan Hagen. "A Study of Books Privately Owned in England, 1300-1450." Ph.D diss., University of Pennsylvania, 1980.
Tuck, Anthony. "Beaufort [married names Ferrers, Neville], Joan, countess of Westmorland (1379?–1440), magnate," in Oxford Dictionary of National Biography (2008).
Jambeck, Karen. "Patterns of Women’s Literary Patronage: England, 1200–ca.1475," in The Cultural Patronage of Medieval Women, ed. June Hall McCash (Athens: University of Georgia Press, 1996), 228–65.