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2. William C. Burger (2003): Perfect Planet, Clever Species—How Unique Are We?, páxs. 24, 34.

3. Peter D. Ward e Donald Brownlee (2000): Rare Earth—Why Complex Life Is Uncommon in the Universe, páx. 224.

4. David Suzuki (2007): The Sacred Balance—Rediscovering Our Place in Nature, páx. 102.

5. M. A. Corey (1993): God and the New Cosmology—The Anthropic Design Argument, páxs. 144-145.

6. Jean-Christophe Vié, Craig Hilton- Taylor, Simon N. Stuart (editores) (2009): Wildlife in a Changing World—An Analysis of the 2008 IUCN Red List of Threatened Species, páx. 6.

7. V. Torsvik, R. Sørheim, J. Goksøyr (1996): “Total Bacterial Diversity in Soil and Sediment Communities—A Review”, Journal of Industrial Microbiology (vol. 17), páxs. 170-178.

8. Dylan Chivian, et al. (10 de outubro de 2008): “Environmental Genomics Reveals a Single-Species Ecosystem Deep Within Earth”, Science (vol. 322), páxs. 275-278.

9. David Biello: “Microbe Census Reveals Air Crawling With Bacteria”, Scientific American, http://www.scientificamerican.com/article.cfm?id=microbe-census-reveals-ai.

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11. “Flippered Flight” (21 de maio de 2004), sección “Random Samples”, Science, páx. 1106.

12. “Is It a Bird, Is It a Plane...” (3 de setembro de 2005), sección “Technology”, New Scientist, páx. 21.

13. Arthur P. Fraas (1989): Heat Exchanger Design, (2^a edición), páx. 2.

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16. Richard Dawkins (novembro de 2005): “Darwin & Evolution—The Illusion of Design”, Natural History, páx. 37.

17. Charles Darwin (primeira edición: 1859; sexta edición: 1872): Origin of Species, páxs. 285-286.

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21. Mutation Breeding, Evolution, and the Law of Recurrent Variation, páxs. 48-51.

22. Mutation Breeding, Evolution, and the Law of Recurrent Variation, páxs. 49-50, 52, 54, 59, 64, e entrevista con Wolf-Ekkehard Lönnig.

23. “Evidence Supporting Biological Evolution” (1999): Science and Creationism—A View From the National Academy of Sciences, páx. 10.

24. “Evidence Supporting Biological Evolution”, Science and Creationism—A View From the National Academy of Sciences, páx. 11.

25. Peter R. Grant (outubro de 1991): “Natural Selection and Darwin’s Finches”, Scientific American, páx. 87.

H. Lisle Gibbs e Peter R. Grant (11 de xuño de 1987): “Oscillating Selection on Darwin’s Finches”, Nature, páx. 511.

Peter R. Grant e B. Rosemary Grant (10 de abril de 1992): “Hybridization of Bird Species”, Science, páxs. 193-197.

26. George C. Williams (1966): Adaption and Natural Selection, páx. 54.

27. Jeffrey H. Schwartz (1999): Sudden Origins—Fossils, Genes, and the Emergence of Species, páxs. 317-320.

 28. “Evidence Supporting Biological Evolution”, Science and Creationism—A View From the National Academy of Sciences, segunda edición, páx. 14.

29. Niles Eldredge (2000): The Triumph of Evolution and the Failure of Creationism, páxs. 49, 85.

30. Richard C. Lewontin (9 de xaneiro de 1997): “Billions and Billions of Demons”, The New York Review of Books, páxs. 28-32.

31. Edward J. Larson e Larry Witham (setembro de 1999): “Scientists and Religion in America”, Scientific American, páx. 91.

32. William B. Provine (1989): “Evolution and the Foundation of Ethics”, Science, Technology, and Social Progress, editado por Steven L. Goldman, páxs. 253, 266.