Very extensive references are provided by John D. <!g>Barrow and Frank J. <!g>Tipler, The Anthropic Cosmological Principle (Oxford: Clarendon Press, 1986), by John Leslie, Physical <!g>Cosmology and Philosophy, ed. John Leslie (New York: Macmillan Publishing Company, 1990), and by George F. <!g>Ellis, Before the Beginning: Cosmology Explained (New York: Boyars/Bowerdean, 1993). For a helpful survey and analysis see <!g>Southgate, <!g>Deane-Drummond, et al., God, Humanity and the <!g>Cosmos, C. 3 Section E.