1. J. Barwise and J. Perry. Situations and Attitudes, The MIT Press, Cambridge, MA, 1983.
2. S. Blackburn. The identity of propositions. In Meaning, Reference and Necessity, S. Blackburn, ed. pp. 182–205. Cambridge University Press, 1975.
3. R. Bradley and N. Swartz. Possible Worlds: An Introduction to Logic and its Philosophy, Hackett Publishing Company, IN, 1979.
4. T. Burge. Belief De Re. The Journal of Philosophy. 69, 338–362, 1977.
5. T. Burge. Belief and synonymy, em Journal of Philosophy, 75, 119–138, 1978.