|Adapted from Crossley, p. 115|
Based on Crossley, p. 108
Military architecture in England during the Middle Ages,
Thompson, p. 115
Religious order: Austin or Black Canons.
Platt, Colin. The Castle in Medieval England and Wales. New York: Barnes and Noble Books, 1981.
Thompson, A. Hamilton. Military architecture in England during the middle ages, by A. Hamilton Thompson ... illustrated by 200 photographs, drawings, and plans. London, New York [etc.]: H. Frowde, 1912.
Toy, Sidney. Castles, a short history of fortifications from 1600 B.C. to A. D. 1600. London, Toronto: W. Heinemann, ltd. .
Rathbone, Jill. "Alnwick Castle" in Archaeological Journal 133 (1976), p. 149.