1. Bulmer, M. 1981. “Charles S. Johnson, Robert E. Park and the Research Methods of the Chicago Commission on Race Relations, 1919–22: An Early Experiment in Applied Social Research.”Ethnic and Racial Studies, 4, 3 (July):289–306.
2. Burgess, E. 1956. “Charles S. Johnson: Social Scientist and Race Relations.”Phylon, 4: 317.
3. Chicago Commission on Race Relations. 1922.The Negro in Chicago: A Study of Race Relations and a Race Riot in 1919. Chicago: The University of Chicago Press; reprint ed., New York: Arno Press and the New York Times, 1968.
4. Frazier, E. F. 1939.The Negro Family in the United States. Chicago: The University of Chicago Press.
5. Park, R.E. 1952.Human Communities. Glencoe, Illinois: The Free Press.