1. Agar, M. H. (1980). The professional stranger: An informal introduction to ethnography. New York: Academic Press
2. Bijou, S. W., Peterson, R. F., & Ault, M. H. (1968). A method to integrate descriptive and experimental field studies at the level of data and empirical concepts. Journal of Applied Behavior Analysis, 1, 175–191.
3. Balch, G. I. (1980). The stick, the carrot, and other strategies: A theoretical analysis of governmental intervention. In J. Brigham & D. W. Brown (Eds.), Policy implementation: Penalties or incentives? (pp. 43–68). Beverly Hills, CA: Sage Publications.
4. Bulmer, M. (1981). Applied social research: A reformulation of “applied” and “enlightenment” models. Knowledge: Creation, Diffusion, Utilization, 3, 187–210.
5. Caputo, D. A. (1977). Public policy making in America: An introduction. In D. A. Caputo (Ed.), The politics of policy making in America: Five case studies (pp. 1–6). San Francisco: W. H. Freeman.