
Wittgenstein in conversation with Maurice O'Connor Drury, cited in Rush Rhees (eds.) Recollections of Wittgenstein: Hermine Wittgenstein--Fania Pascal--F.R. Leavis--John King--M. O'C. Drury, Oxford University Press, 1984; p. xvi, and p. 168.
Attributed from posthumous publications