1. Chandra, S. (2002). Wittgenstein: New perspectives. New Delhi: Indian Council of Philosophical Research.
2. Findlay, J. N. (1984). Wittgenstein: A critique. Routledge.
3. Gupta, B. (2003). CIT: Consciousness. Oxford University Press.
4. Hacker, P. M. S. (1972). Insight and Illusion: Wittgenstein on philosophy and the metaphysics of experience. Clarendon Press.
5. Hintikka, J. (1958). On Wittgenstein’s ‘Solipsism’. Mind, 67(265), 88–91.