Richard III of England,
Ownership Confirmed (?-1485) by Inscription.
Margaret Beaufort, countess of Richmond and Derby,
Ownership Confirmed (1485-1509) by Will.
Powell, Susan. "Lady Margaret Beaufort and Her Books," The Library 6, no. 3 (1998): 197-240.
Sutton, Anne F., and Livia Visser-Fuchs. The Hours of Richard III (Stroud : Alan Sutton for Richard III & Yorkist History Trust, 1990).