1. Marshall, A. The Principles of Economics. London: Macmillan, 1890.
2. Marshall, A. The Principles of Economics., 8th ed. London: Macmillan, 1920. [Reprinted in 1961.]
3. Milgate, M. "Equilibrium: Development of the Concept." In J. Eatwell, M. Milgate, and P. Newman (eds.), The New Palgrave: A Dictionary of Economics. London: Macmillan, 1987, pp. 179-182.
4. Mirowski, P. More Heat Than Light: Economics as Social Physics, Physics as Nature's Economics. Cambridge: Cambridge University Press, 1989.
5. Prigogine, I. From Being to Becoming: Time and Complexity in the Physical Sciences. New York: W.H. Freeman, 1981.