1. On the Origin of Species by Means of Natural Selection;C Darwin,1876
2. Darwinism: an Exposition of the Theory of Natural Selection, with Some of its Applications;AR Wallace,1889
3. Alfred Russel Wallace: Letters and Reminiscences;J Marchant,1916
4. The genetical theory of natural selection;RA Fisher,1930
5. Genetics and the origin of species;T Dobzhansky,1937