1. Lifton Robert Jay, Death in Life, New York: Random House, 1968, pp. 540–541.
2. Freud Sigmund, “Thoughts for the Times on War and Death,” Standard Edition, London: The Holgarth Press and the Institute of Psychoanalysis, 1957, Vol. XIV, p. 289.
3. Jung Carl, Modern Man in Search of a Soul, New York: Harcourt Brace, 1936, p. 129.