(en) Adam Kuperavage et al., «Earliest Known Hominin Calcar Femorale in Orrorin tugenensis Provides Further Internal Anatomical Evidence for Origin of Human Bipedal Locomotion», The Anatomical Record, , p.1834-1839 (DOI10.1002/ar.23939, lire en ligne)
(en) Adam Kuperavage et al., «Earliest Known Hominin Calcar Femorale in Orrorin tugenensis Provides Further Internal Anatomical Evidence for Origin of Human Bipedal Locomotion», The Anatomical Record, , p.1834-1839 (DOI10.1002/ar.23939, lire en ligne)