1. Andrews, J. and Paulson, M.: Effect of Barium Sulphate Upon the Incidence of Human Protozoa.J. Lab. and Clin. Med., 16 :39, Oct., 1930.
2. Andrews, J. and Paulson, M.: Incidence of Human Intestinal Protozoa with Especial References to Endamoeba Histolytica.Am. J. M. Sc., 181:102, 1931.
3. Boeck, Wm. D. and Stiles, C. W. : Studies on Various Intestinal Parasites (especially amoeba) of Man. Hyg. Lab. Bull., 133,U. S. P. H. S., Oct., 1923.
4. Borland, J. L.: The Minimum Incidence of Intestinal Protozoa in a Representative Sampling of the Adult Population in Florida.South. M. J., 32:364, April, 1939.
5. Craig, C. F.: The Pathology of Amoebiasis in Carrier.Am. J. Trop. Med., 12:284, 1932.