1. Le Gros Clark, W. E. & Leakey, L. S. B. The Miocene Hominoidea of East Africa (British Museum (Natural History), London, 1951).
2. Johanson, D. C. & White, T. D. Science 202, 321 (1979).
3. de Bonis, L. & Melentis, J. Annls Paléont. 64, 185 (1978).
4. Andrews, P. & Tekkaya, I. Palaeontology 23, 85 (1980).
5. Qingwu, L., Xu, Q. & Zheng, L. Vert. PalAsiat. 19, 101 (1981).