1. Freud, Sigmund: A General Introduction to Psychoanalysis. Pp. 297–299. Liveright. New York. 1935.
2. Fenichel, Otto: The Psychoanalytic Theory of Neurosis. Pp. 461–463. Norton. New York. 1945.
3. Parsons, Talbot: Am. J. Orthopsychiat., 21:3, July 1951.
4. Fenichel, Otto:-Op. cit.
5. Fromm, Erich: Escape from Freedom. Farrar & Rinehart. New York. 1951.