1. Allen, G. E. Thomas Hunt Morgan: the Man and his Science (Princeton Univ. Press, Princeton, New Jersey, 1978).
2. Sandler, I. & Sandler, L. A conceptual ambiguity that contributed to the neglect of Mendel's paper. Pubbl. Stn. Zool. Napoli II 7, 3–70 (1985).
3. Sturtevant, A. H. in A History of Genetics 23 (Harper & Row, New York, 1965).
4. Olby, R. C. in Origins of Mendelism 55–85 (Schocken Books, New York, 1966).
5. Darwin, C. A Monograph of the Sub-class Cirripedia Vol. 1 (The Ray Society, London, 1851).