Margaret Beaufort, countess of Richmond and Derby,
Ownership Confirmed (c. 1500-1509) by Other (original).
Powell, Susan. "Lady Margaret Beaufort and Her Books," The Library 6, no. 3 (1998): 197-240.
Jones, Michael K., and Malcom G. Underwood. The King's Mother: Lady Margaret Beaufort, Countess of Richmond and Derby (Cambridge: Cambridge University Press, 1993).