1. Bailey, K. D. (1968).Human Ecology: A General Systems Approach, Unpublished Ph.D. dissertation, University of Texas, Austin.
2. Bailey, K. D. (1981). Abstracted Versus concrete sociological theory.Behav. Sci. 26, 313–323.
3. Bailey, K. D. (1990).Social Entropy Theory, State University of New York Press, Albany.
4. Bailey, K. D. (1994).Sociology and the New Systems Theory: Toward A Theoretical Synthesis, State University of New York Press, Albany.
5. Berry, B. J. L. (1964). Cities as systems within systems of cities.Papers Proc. Region. Sci. Assoc. 13, 147–163.