1. Jones O. R. (ed.) The Private Language Argument
2. Kenny , op. cit., 194.
3. Remarks on the Foundations of Mathematics, II, §37.
4. ‘Notes for Lectures’, Philosophical Review, 77, 1968, 276–277, 314, 320
5. A Companion to Wittgenstein's Tractatus, Cambridge University Press, 1964, 2).