Dollard, J., and Miller, N.E.: Personality and Psychotherapy. New York: McGraw-Hill, 1950.
2.
Hill, R.: "Generic Features of Families Under Stress", in Crisis Intervention: Selected Readings, H. J. Parad 3. (ed.). New York: Family Service Association of America, 1965.
3.
Harlow, H.F., and Zimmerman, R.R.: Science, 130: 421-432, 1959.