1. Aguirre, E. 1970. Identificacion de “Paranthropus” en Makapansgat, in: Cronica del XI Congreso Nacional de Arqueologia, Merida 1969, pp. 98–124.
2. Aguirre, E. 1972. Les rapports phylétiques de Ramapithecus et Kenyapithecus et le origine des Hominidés. Anthropologie (Paris) 76: 501–523.
3. Aguirre, E. 1975. Kenyapithecus and Ramapithecus. in: Paleoanthropology, Morphology and Paleoecology ( R. H. Tuttle, ed.), pp. 99–104, Mouton, The Hague.
4. Andrews, P. J. 1978. A revision of the Miocene Hominoidea of East Africa. Bull. Br. Mus. (Nat. Hist.) Geol. 30 (2): 85–224.
5. Andrews, P. J., and Tekkaya, I. 1980. A revision of the Turkish Miocene hominoid Sivapithecus meteai. Palaeontology 23: 85–95.