1. Ackoff, R.L., and F.E. Emery1972On Purposeful Systems. Chicago: Aldine-Atherton.
2. Ader, R., ed.1980Psychoneuroimmunology. New York: Academic Press.
3. Arbib, M.A.1972The Metaphorical Brain. New York: Wiley.
4. Bateson, G.1979Mind and Nature. New York: Dutton.
5. Beck, A T .1967Depression: Causes and Treatment. Philadelphia: University of Pennsylvania Press.