1. Freud, Sigmund. 1949.Collected Papers, Vol. I, 252London: The Hogarth Press.
2. Fenichel, Otto. 1945.The Psychoanalytic Theory of Neurosis, 465New York: W. W. Norton & Co.
3. Levine, Maurice. 1942.Psychotherapy in Medical Practice, 41–42. New York: The MacMillan Co.
4. Symposium: The treatment of behavior and personality problems in children: A. The psychiatrist.