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Strachey, J., Freud, A., Strachey, A. & Tyson, A. (1961) The Standard Edition of the Complete Psychological Works of Sigmund Freud, Volume XXI (1927-1931): The Future of an Illusion, Civilization and its Discontents, and Other Works. The Standard Edition of the Complete Psychological Works of Sigmund Freud 21:1-273