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Citation
Freud, Sigmund. New Introductory Lectures on Psycho-Analysis, translated by James Strachey. W. W. Norton & Company, 1990, lecture 31. Originally published as Neue Folge der Vorlesungen zur Einfuhrung in die Psychoanalyse [New Introductory Lectures on Psycho-analysis]. Internationaler Psychoanalytischer Verlag, 1933, lecture 31.