1. Hurst, Arthur, and Stewart, Mathew J.: “Gastric and Duodenal Ulcers. Oxford U. Press, 1929.
2. Draper, George: “Disease and the Man,” The Macmillan, 1930.
3. Sturtevant, Mills, and Shapiro, Louis L.: “Frequency, Number, Size, Shape, Location, Color, Sex and Age in Seven Thousand, Seven Hundred Necropsy Records at Bellevue Hospital, N. Y.Arch. Int. Med., Vol. 38, pp. 41–56, July, 1926.
4. Smithies, Frank: “On the Present Status of the Treatment of Peptic Ulcer.”Ann. of Clin. Med., Vol. 5, No. 10, April, 1927.
5. Meek, W. J.: “Functions of the Gastro-intestinal Tract with Special Reference to Ulcer Producing Gastro-intestinal Malfunctions.”The Wisconsin Med. Jour., p. 534, July, 1931.