1. Armstrong, D. 1989. A combinatorial theory of possibility. New York: Cambridge University Press.
2. Asimov, I. 1956/1990. The last question. In The complete stories, vol. 1, 290–300. New York: Doubleday.
3. Barrow, J., and F. Tipler. 1986. The anthropic cosmological principle. New York: Oxford University Press.
4. Burley, M. 2013. Retributive karma and blaming the victim. International Journal for Religious Studies 74: 149–165.
5. ———. 2014. Karma, morality, and evil. Philosophy Compass 9 (6): 415–430.