1. John Gribbin, The Omega Point: The Search for the Missing Mass and the Ultimate Fate of the Universe (New York: Bantam Books, 1988), p. 2.
2. Edward Harrison, Cosmology (London: Cambridge University Press, 1961), p. 300.
3. Asimov, Isaac, “The Last Question,” in The Best of Isaac Asimov (Garden City, New York: Doubleday, 1974), pp. 157–169.
4. Bailey, James, Pilgrims Through Space and Time: Trends and Patterns in Utopian and Science Fiction (Westport, Connecticut: Greenwood Press, 1972).
5. Barrow, John, and lîpler, Frank, The Anthropic Cosmological Principle (New York: Oxford University Press, 1986).