Hartmann, H. (1939). Ego Psychology and the Problem of Adaptation.New York: Int. Univ. Press, 1964.
3.
Klein, G. S. (1976). Psychoanalytic Theory: An Exploration of Essentials.New York: Int. Univ. Press.
4.
Kuhn, T. S. (1962). The Structure of Scientific Revolutions.Chicago: Univ. Chicago Press, 1970.
5.
Waelder, R. (1930). The principle of multiple function: observations on overdetermination. In Psychoanalysis: Observation, Theory, Application, ed. S. A. Guttman.New York: Int. Univ. Press, 1976, pp. 68–83.