McHenry, H.M, Human Evolution, in Michael Ruse & Joseph Travis (a cura di), Evolution: The First Four Billion Years, Cambridge, Massachusetts, The Belknap Press of Harvard University Press, 2009, pp. 261–265, ISBN978-0-674-03175-3.
Richmond BG, Begun DR, Strait DS. (2001). Origin of human bipedalism: The knuckle-walking hypothesis revisited. Am J Phys Anthropol. Suppl 33:70-105. PMID 11786992
Thorpe SK, Holder RL, Crompton RH. (2007). Origin of human bipedalism as an adaptation for locomotion on flexible branches. Science. 316(5829): 1328-31. PMID 17540902