1. Hilton, John: Lectures on Rest and Pain. 5th Ed. George Bell & Sons. London, 1930.
2. Milligan, E. T. C., and Morgan, C. N.: Surgical Anatomy of the Anal Canal.Lancet, pp. 1150 and 1213, Nov. 24 and Dec. 1, 1934.
3. Daniels, E. A.: The Ano-Rectum in Chronic Constipation.Canad. Med. Assoc. J., 34, 169, 1936.
4. Abel, A. L.: The Pecten, The Pecten Band, Pectenosis and Pectenotomy.Lancet, 1:714, 1932.
5. Daniels, E. A.: Disturbances produced in the Rectum by Discase Elsewhere.Canad. Med. Assoc. J., 28:499, 1933.