1. Paul K., Feyerabend, ?Realism and Instrumentalism: Comments on the Logic of Factual Support,? in The Critical Approach to Science and Philosophy, ed. Mario, Bunge (London: Macmillan, 1964), p. 305.
2. Julian, Huxley, Evolution: The Modern Synthesis, 2nd ed. (London: Allen and Unwin, 1963).
3. Ernst, Mayr, Animal Species and Evolution (Cambridge, Mass.: Belknap Press of Harvard University Press, 1963).
4. Niles, Eldredge and Stephen J., Gould, ?Punctuated Equilibria: An Alternative to Phyletic gradualism,? in Models in Paleobiology ed. Thomas J. M., Schopf (San Franciso: Freeman, 1972), pp. 82?115. Stephen J. Gould and Niles Eldredge, ?Punctuated Equilibria: The Tempo and Mode of Evolution Reconsidered,? Paleobiology, 3, (1977), 115?151.
5. Ernst, Mayr, Animal Species and Evolution (Cambridge, Mass.: Belknap Press of Harvard University Press, 1963). p. 481.