1. Burks, A. W. (1977). Chance, cause and reason. Chicago: Chicago University Press.
2. Burtt, E. A. (1932). The metaphysical foundations of modern science. London: Routledge and Kegan Paul.
3. Feynman, R. P., Leighton, R., & Sands, M. (1965). The Feynman lectures on physics (Vol. II). Reading, Mass: Addison-Wesley Publishing Co.
4. Friedman, M. (1974). Explanation and scientific understanding. Journal of Philosophy, 71, 5–19.
5. Greene, B. (1999). The elegant universe. New York: W. W. Norton.