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2. Allen, G. E.: 1968, ‘Thomas Hunt Morgan and the Problem of Natural Selection’, Journal of the History of Biology 1, 113–139.
3. Allen, G. E.: 1978, Thomas Hunt Morgan and His Science, Princeton University Press, Princeton, NJ.
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5. Allen, G. E.: 1986, ‘Thomas Hunt Morgan and the Split between Embryology and Genetics, 1910–35’, in T. J. Horder, J. A. Witkowski and C. C. Wylie (eds.), A History of Embryology, Cambridge University Press, Cambridge, pp. 1910–1935.