1. Azzouni, Jody. 2000. Knowledge and reference in empirical science. London: Routledge.
2. ———. 2010b. Talking about nothing: Numbers, hallucinations and fictions. Oxford: Oxford University Press.
3. Baddeley, Alan, Michael W. Eysenck, and Michael C. Anderson. 2015. Memory. 2nd ed. London/New York: Psychology Press.
4. Descartes, René. 1993. Meditations on first philosophy. Trans. Donald A. Cress. Indianapolis/Cambridge: Hackett Publishing Company.
5. Kripke, Saul. 1982. Wittgenstein on rules and private language. Cambridge, MA: Harvard University Press.