John Beaufort, Duke of Somerset,
Ownership Possible (14??-1444) by Other.
Margaret Beaufort, countess of Richmond and Derby,
Ownership Confirmed (1444-1502) by Inscription.
Ownership Confirmed (1502-15??) by Inscription.
Powell, Susan. "Lady Margaret Beaufort and Her Books," The Library 6, no. 3 (1998): 197-240.: 203
Jones, Michael K., and Malcom G. Underwood. The King's Mother: Lady Margaret Beaufort, Countess of Richmond and Derby (Cambridge: Cambridge University Press, 1993).