1. Kierkegaard, S. (1957) The Concept of Dread (Lowrie, W., trans.) Princeton University Press, Princeton, NJ, p. 38.
2. Becker, E. (1968) The Structure of Evil. The Free Press, New York, NY, p. 379.
3. Ricoeur, P. (1969) The Symbolism of Evil. (Buchanan, E., trans). Beacon Press, Boston, MA, pp. 27, 30–37.
4. Pagels, E. (1979) The Gnostic Gospels. Random House, New York, NY, pp. 143–146.
5. Alford, C.F. (1997) What Evil Means to Us. Cornell University Press, Ithaca, NY, pp. 10–11.