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Strachey, J., Freud, A., Strachey, A. & Tyson, A. (1957) The Standard Edition of the Complete Psychological Works of Sigmund Freud, Volume XIV (1914-1916): On the History of the Psycho-Analytic Movement, Papers on Metapsychology and Other Works. The Standard Edition of the Complete Psychological Works of Sigmund Freud 14:ii-viii