1. Aczél, J.: 1966, Lectures on Functional Equations and Their Applications, Academic Press, New York.
2. Carnap, R.: 1962, The Logical Foundations of Probability, University of Chicago Press, Chicago.
3. Carnap, R.: 1975, ?Notes on Probability and Induction?, in J.Hintikka (ed.), Rudolf Carnap, Logical Empiricist, Reidel, Dordrecht, pp. 293?324.
4. Chuaqui, R.: 1977, ?A Semantical Definition of Probability?, in A. I.Arruda, N. C. A.daCosta and R.Chuaqui (eds.), Non-Classical Logics, Model Theory, and Computability, North-Holland, Amsterdam, pp. 135?167.
5. Chuaqui, R.: ?Factual and Cognitive Probability?, to appear.