Brown, J.S.Gradients of approach and avoidance responses and their relation to level of motivation. Journal of. ComparativePhysiological Psychology . 1948, 41, 450-465.
2.
Miller, N.E.Experimental studies of conflict. In J. McV. Hunt (Ed.), Personality and the Behavior Disorders . New York: Ronald, 1944.
3.
Miller, N.E.Liberalization of basic S-R concepts: Extensions to conflict behavior, motivation, and social learning. In S. Koch (Ed.) Psychology: A Study of Science. Vol. 2. New York: McGraw-Hill , 1959.
4.
Epstein, S.The measure of drive and conflict in humans: theory and experiment . In M. R. Jones (Ed.), Nebraska Symposium on Motivation, 1962. Lincoln : University of Nebraska Press, 1962. Pp. 127-209.
