Watson, A. G., & Ker, N. R. (1987). Medieval libraries of Great Britain, a list of surviving books, edited by N. R. Ker: Supplement to the second edition. London: Offices of the Royal Historical Society.

Watson, Andrew G., and N. R. Ker. Medieval Libraries of Great Britain, a List of Surviving Books, Edited By N. R. Ker: Supplement to the Second Edition. London: Offices of the Royal Historical Society, 1987.

Watson, Andrew G., and N. R. Ker. Medieval Libraries of Great Britain, a List of Surviving Books, Edited By N. R. Ker: Supplement to the Second Edition. London: Offices of the Royal Historical Society, 1987.