Th. Dobzhansky, Genetics and the origin of species, Columbia University Press, 3a ed., New York 1931.
Pagina 264
D. T. Parkin, An introduction to evolutionary genetics, Edward Arnold, London 1979.
Pagina 265
Th. Dobzhansky, Genetics of the evolutionary process, Columbia University Press, New York 1970.
Pagina 265