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- Sigmund Freud; der Mann, die Lehre, die Schule. Leipzig: Tal, 1924. Translated by Cedar and Eden Paul as Sigmund Freud, his personality, his teaching, & his school, London: G. Allen & Unwin, .
- Die vernichtung der not. Translated by Cedar and Eden Paul as An end to poverty, London: G. Allen & Unwin, 1925.
- Critique of love. New York: The Macaulay Company, 1929.
- Die Befreiung des Kindes, 1927. Translated by Cedar and Eden Paul as Set the Children Free!, London: G. Allen & Unwin, Ltd., .
- Translated by Louise Brink as Freud and his time: the influence of the master psychologist on the emotional problems in our lives, New York: Liveright, 1931.
- (ed. by Edward Timms) Freud and the child woman: the memoirs of Fritz Wittels, New Haven: Yale University Press, 1995
- "[M]y parents, who were full of the Wagnerian enthusiasm of those days, named me Siegfried. I was always ashamed of that name, which was too glorious to be used on weekdays, so they called me Fritz..." Fritz Wittels (1995). Edward Timms, ed. Freud and the Child Woman: The Memoirs of Fritz Wittels. Yale University Press. p. 9. ISBN 978-0-300-06485-8. Retrieved 9 June 2012.
- Elke Mühleitner, Wittels, Fritz (Siegfried) (1880-1950), International Dictionary of Psychoanalysis
- David V. Forrest, review of Edward Timms, ed., Freud and the Child Woman: The Memoirs of Fritz Wittels, in American Journal of Psychiatry 155:707, May 1998