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  1.  11
    Biology and Man.George Gaylord Simpson - 1969 - New York: Harcourt, Brace & World.
  2. This Is Race. An Anthology Selected From the International Literature on the Races of Man.Earl W. Count, Carleton S. Coon, Stanley M. Garn, Joseph B. Birdsell, George Gaylord Simpson & Ashley Montagu - 1951 - Science and Society 15 (1):68-74.
  3. Section A. Phylogeny 29.George Gaylord Simpson - 1965 - In Karl W. Linsenmann (ed.), Proceedings. St. Louis, Lutheran Academy for Scholarship.
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  4.  21
    Horotely, Bradytely, and Tachytely.George Gaylord Simpson - unknown
    t is abundantly evident that rates of evolution vary. They vary greatly from group to group, and even among closely related lineages there may be strikingly different rates. Differences in rates of evolution, and not only divergent evolution at comparable rates, are among the reasons for the great diversity of organisms on the earth. Among the living primates there are, for instance, some rather unspecialized or primitive prosimians (i.e., little changed from Eocene progenitors), a larger number of divergently specialized prosimians, (...)
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  5.  8
    The Act of CreationArthur Koestler.George Gaylord Simpson - 1966 - Isis 57 (1):126-127.
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