1. Sigmund Freud, 1905, “Three Essays on the Theory of Sexuality,” in The Standard Edition, ed. J. Strachey (London: Hogarth Press, 1958), 7:125–243, p. 176.
2. Sigmund Freud, 1909, “Analysis of a Phobia in a Five-Year-Old Boy,” in The Standard Edition, ed. J. Strachey (London: Hogarth Press, 1958), 12:213–218.
3. Rene Spitz, Hospitalism: An Inquiry into the Genesis of Psychiatric Conditions in Early Childhood, Psychoanalytic Study of the Child, vol. 1 (1945), pp. 313–342.
4. Anna Freud, Normality and Pathology in Childhood: Assessments of Development (New York: International Universities Press, 1965).
5. Ibid., p. 59.