1. S. Beer, 1968, Management Science, Doubleday, New York.
2. S. Beer, 1975, Designing Freedom, John Wiley, London.
3. D. T. Campbell, 1974, “Evolutionary Epistemology.” In: The Philosophy of Karl Popper, edited by P. Schilpp, Open Court, LaSalle, Illinois.
4. R. Cavallo and G. J. Klir, 1977, “A conceptual foundation for systems problem solving.” International Journal of Systems Science (forthcoming).
5. R. Cavallo and M. Conklin, 1977, “Systems methodology in sociology.” International Journal of Systems Science, 8 (1977), 1, pp. 65–80.