1. Carnap, R.: 1950,Logical Foundations of Probability, The University of Chicago Press, Chicago.
2. Carnap, R.: 1952,The Continuum of Inductive Methods, The University of Chicago Press, Chicago.
3. Carnap, R.: 1962, ?The Aim of Inductive Logic?, in E. Nagel, P. Suppes and A. Tarski (eds.),Logic, Methodology and Philosophy of Science, Stanford University Press, Stanford.
4. Costantini, D. and L. Geymonat: 1982,Filosofia della probabilità, Feltrinelli, Milano.
5. de Finetti, B.: 1929, ?Funzione caratteristica di un fenomeno aleatorio?, inAtti del Congresso Internazionale dei matematici, Zanichelli, pp. 179?90. Also in de Finetti (1981), pp. 97?108.