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Dennett, Daniel (1995). Darwin's Dangerous Idea. Simon & Schuster. .

Huxley, Julian (1942). Evolution: The Modern Synthesis, London: George Allen and Unwin.

Simpson, George G. (1957). Life Of The Past: Introduction to Paleontology. Yale University Press, p. 119.

Wilkins, John (1997). "What is macroevolution?" 13 October 2004.