1. Achinstein, P. (2010). What to do if you want to defend a theory you cannot prove: A method of “physical speculation”. The Journal of Philosophy, 107, 35–55.
2. Audi, R. (Ed.). (1999). The cambridge dictionary of philosophy. Cambridge: Cambridge University Press.
3. Austin, J. (1962). How to do things woth words. Oxford: Oxford University Press.
4. Beller, M. (2000). Kant’s impact on Einstein’s thought. In D. Howard & J. Stachel (Eds.), Einstein: The formative years, 1879–1909. Boston: Birkhauser. Chapter 4.
5. Boltzmann, L. (1895). Über Faraday’s Kraftlinien, von James Clerk Maxwell. Herausgegeben von. L. Boltzmann. Leipzig: W. Engelmann.