McCollum, MA; Rosenman, BA; Suwa, G; Meindl, RS; Lovejoy, CO (March 15, 2010). "The vertebral formula of the last common ancestor of African apes and humans". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 314 (2): 123–34. doi:10.1002/jez.b.21316. PMID19688850. (Abstract)
McCollum, MA; Rosenman, BA; Suwa, G; Meindl, RS; Lovejoy, CO (March 15, 2010). "The vertebral formula of the last common ancestor of African apes and humans". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 314 (2): 123–34. doi:10.1002/jez.b.21316. PMID19688850. (Abstract)