Clark, W. C. (1976). "The Environment and the Genotype in Polymorphism". Zoological Journal of the Linnaean Society. 58 (3): 255–262. doi:10.1111/j.1096-3642.1976.tb00831.x.
Clark, W. C. (1976). "The Environment and the Genotype in Polymorphism". Zoological Journal of the Linnaean Society. 58 (3): 255–262. doi:10.1111/j.1096-3642.1976.tb00831.x.