φ Freud, Sigmund. "Notes Upon A Case of Obsessional Neurosis (1909)" The Standard Edition of the Complete Psychological Works of Sigmund Freud vol. 10. London: Vintage Books, 2001. p. 163
φ Freud, Sigmund. "Notes Upon A Case of Obsessional Neurosis (1909)" The Standard Edition of the Complete Psychological Works of Sigmund Freud vol. 10. London: Vintage Books, 2001. p. 163