1. Burns, Herbert A.: A study of the incidence of tuberculosis in state hospitals in Minnesota. Amer. Rev. Tub., 33, No. 6, June, 1936, pp. 813–824.
2. Garvin, William C.: Overcrowding and tuberculosis in state hospitals. State Hospital Quarterly, Vol. 9, No. 1, November, 1923, pp. 58–64.