1. Anscombe, G. E. M., 1959. An Introduction to Wittgenstein's Tractatus, New York: Harper & Row Publishers.
2. Biletzki, A., 2003. (Over) Interpreting Wittgenstein, London: Kluwer Academic Publishers.
3. Carruthers, P., 1990. The Metaphysics of the Tractatus, Cambridge University Press.
4. Chandra, S., 2002. Wittgenstein: New Perspectives, New Delhi: Indian Council of Philosophical Research.
5. Conant, J., 2000. Elucidation and Nonsense in Frege and Early Wittgenstein in The New Wittgenstein, Ed. A. Crary and R. Read, London & New York: Routledge.