Federn's Annotation of Freud's Theory of Anxiety

Freud, S. The Ego and the Id (1936). London: Hogarth Press, 1949.

Freud, S. The Problem of Anxiety (1936), tr. H. A. Bunker. New York: Norton.

Waelder, R. Review of Freud's Hemmung, Symptom and Angst. Int. J. Psychoanal., 10:103–111, 1928.

Waelder, R. Basic Theory of Psychoanalysis. New York: International Universities Press, 1960.

Weiss, E. Introduction to Paul Federn's Ego Psychology and the Psychases. New York: Basic Books, 1952, p. 8.