1. Skinner, B. F.: The Behavior of Organisms. Ed. 1. New York, Appleton-Century-Crofts, Inc., 1938.
2. Berne, E.: Games People Play; the Psychology of Human Relationships. Ed. 1. New York, Grove Press, Inc., 1964, pp. 159–162.
3. Behavioral Analysis
4. Differential Diagnosis and Treatment of Depressive Disorders