1. Barwise J., Perry J. (1990) Semantic innocence and uncompromising situations. In: Martinich A.P. (eds) The philosophy of language (2nd ed). Oxford University Press, Oxford
2. Beall J.C., van Fraassen B.C. (2003) Possibilities and paradox. Oxford University Press, New York
3. Black M. (1962) Metaphor. In: Black M. (eds) Models and metaphors. Cornell University Press, Ithaca, NY
4. Block, N. (1998). Semantics, conceptual role. In E. Craig (Ed.), Routledge encyclopedia of philosophy. London: Routledge. Retrieved December 01, 2006, from http://www.rep.routledge.com/article/ W037.
5. Boisvert D., Lubbers C. (2003) Frege’s commitment to an infinite hierarchy of senses. Philosophical Papers 32: 31–64