Park, R. E., & Burgess, E. W. (1969). Introduction to the science of sociology: Including the original index to basic sociological concepts (3d ed. rev.). University of Chicago Press.

Park, Robert Ezra, and Ernest Watson Burgess. Introduction to the Science of Sociology: Including the Original Index to Basic Sociological Concepts. 3d ed. rev. Chicago: University of Chicago Press, 1969.

Park, Robert Ezra, and Ernest Watson Burgess. Introduction to the Science of Sociology: Including the Original Index to Basic Sociological Concepts. 3d ed. rev. University of Chicago Press, 1969.