1. Freud, E. (1961) (ed).Sigmund Freud Letters 1873?1939. London, 1961; trans. J. Merino. Madrid: Biblioteca Nueva, 1963.
2. Freud, S. (1887?1902).The Origins of Psycho-Analysis: Letters to Wilhelm Fliess, Drafts and Notes: 1887?1902. New York: Basic Books.
3. Freud, S. (1887?1904).The Complete Letters of Sigmund Freud to Whilhelm Fliess, 1887?1904. J.M. Masson (trans. and ed.). Cambridge, Mass: Harvard University Press, 1985.
4. Freud, S. (1900). The interpretation of dreams.Standard Edition, Vols. 4 and 5.
5. Freud, S. (1905). Jokes and their relation to the unconscious.Standard Edition, Vol. 8.