1. D. J. Foulis and C. H. Randall, ?Operational statistics, I, Basic concepts,?J. Math. Phys. 13, 1667 (1972).
2. C. H. Randall and D. J. Foulis, ?Operational statistics, II, Manuals of operations and their logics,?J. Math. Phys. 14, 1472 (1973).
3. C. H. Randall and D. J. Foulis, ?A mathematical setting for inductive reasoning,? inFoundations of Probability Theory, Statistical Inference, and Statistical Theories of Science, C. Hooker, ed., Vol. III (D. Reidel, Dordrecht, Holland, 1976).
4. C. H. Randall and D. J. Foulis, ?The operational approach to quantum mechanics,? inThe Logico-Algebraic Approach to Quantum Mechanics, C. Hooker, ed., Vol. III (D. Reidel, Dordrecht, Holland, 1978).
5. B. De Finetti,Probability, Induction, and Statistics: The Art of Guessing (Wiley, New York, 1972).