1. Haldane, J. B. S. J. Genet. 12, 101–109 (1922).
2. Coyne, J. A. & Orr, H. A. in Speciation and its Consequences (eds Otte, D. & Endler, J.) 180–207 (Sinauer Associates, Sunderland, Massachusetts, 1989).
3. Coyne, J. Nature 355, 511–515 (1992).
4. Dobzhansky, T. Genetics and the Origin of Species (Columbia Univ. Press, New York, 1937).
5. Muller, H. J. in The New Systematics (eds Huxley, J. S.) 185–268 (Clarendon, Oxford, 1940).