1. The history of natural history was dominated by the question of species;Canguilhem,1981
2. The Growth of Biological Thought;Mayr,1982
3. The History of Biology;Nordenskiöld,1946
4. Styles of Scientific Thinking;Crombie,1994
5. A Critique of the Species Concept in Biology;Dobzhansky;Philosophy of Science,1935