1. Aristotle. (2018). Metaphysics book iota. Oxford: Clarendon Press. (trans: Laura M Castelli).
2. Ayer, A. J. (1972). Probability and evidence. London: Macmillan.
3. Ayer, A. J. (1973). What is a law of nature? The concept of a person and other essays (pp. 209–235). London: Macmillan.
4. Bird, A. (2003). Philosophy of science. London: Routledge.
5. Carnap, R. (1995). An introduction to the philosophy of science. New York: Dover Publication.