1. “History of Medicine.” Toronto, Blakiston Co., 1947. Pp. 43; 813.
2. Monograph Ser;Langer,1960
3. “History of Medicine.” Springfield, Ill., Charles C. Thomas, Publisher, 1954 Vol. 1, p. 95.
4. Reprinted in “Surgical Papers,” vol II, p. 257. Baltimore, The Johns Hopkins Press, 1924.