1. , , , and n. d. Maboko Island and Majiwa. Unpublished manuscript.
2. and 1976 Ramapithecus in Kenya and Turkey. In: Les Plus Anciens Hominidés. P. V. Tobias and Y. Coppens, eds. Union Internationale des Sciences Préhistoriques et Protohistoriques (IXth Congrés), preprint pp. 7-25.
3. New Miocene locality in Turkey with evidence on the origin of Ramapithecus and Sivapithecus
4. and 1975 Paleoenvironments in the East African Miocene. In: Approaches to Primate Paleobiology. F. S. Szalay, ed. Contributions to Primatology, 5: 62-103.
5. and 1976 The primate and other fauna from Fort Ternan, Kenya. In: Human Origins. and , eds. W. A. Benjamin, Inc., Menlo Park, pp. 279-304.