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-The Tree of Life - www.tolweb.org
-The Variety of Life, Colin Tudge, 2000
-Paleos.org- http://www.palaeos.org
-Every Living Thing, Robb Dunn, 2009
-Brock Biology of Microorganisms, Madigan et al., 2012
-Life on Earth, An Encyclopedia of Biodiversity, Ecology and Evolution (Vol1), Niles Eldredge, 2002
-The Diversity of Fishes, Helfman et al.,  2009
-The Rise of Placental Mammals, Kenneth D. Rose and J. David Archibald, 2005
-Horns, Tusks and Flippers, Donald R. Prothero and Robert M. Schoch, 2002

Citation: García, A.I. 2011. The Tree Of Nature (Online) at http://thetreeofnature.com

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