Kirk, John Thomas Osmond (2007). Science & Certainty. Csiro Publishing. p. 79. ISBN 978-0-643-09391-1.
Thunstad, Erik (2009). Darwins teori, evolusjon gjennom 400 år (in Norwegian). Oslo, Norway: Humanist forlag. p. 404. ISBN 978-82-92622-53-7.
Reece, J.; Meyers, N.; Urry, L.; Cain, M.; Wasserman, S.; Minorsky, P.; Jackson, R.; Cooke, B. Cambell Biology, 9th Edition. Pearson. p. 586. ISBN 978-1-4425-3176-5.
Buller, A. R.; Townsend, C. A. (19 Feb 2013). "Intrinsic evolutionary constraints on protease structure, enzyme acylation, and the identity of the catalytic triad.". Proceedings of the National Academy of Sciences of the United States of America. 110 (8): E653–61.
Gould, S.J. (1989). Wonderful Life: The Burgess Shale and the Nature of History. W.W. Norton. pp. 282–285. ISBN 978-0-09-174271-3.
Conway Morris, Simon (2005). Life's solution: inevitable humans in a lonely universe. Cambridge University Press. pp. 164, 167, 170 and 235. ISBN 0-521-60325-0. OCLC 156902715. doi:10.2277/0521827043.
Lomolino, M; Riddle, B; Whittaker, R; Brown, J. Biogeography, Fourth Edition. Sinauer Associates. p. 426. ISBN 978-0-87893-494-2.
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