1. Berofsky, B. (1987) Freedom from Necessity. Routledge & Kegan Paul.
2. Carnap, R. (1950). Logical Foundations of Probability. University of Chicago Press.
3. Carnap, R. (1966). Philosophical Foundations of Physics: An Introduction to the Philosophy of Science. Basic Books.
4. Inductive Logic and Inductive Intuition