1. Late Pliocene Faunal Turnover in the Turkana Basin, Kenya and Ethiopia
2. 1997. Eco Homo: how the human being emerged from the cataclysmic history of the Earth. New York: Harper Collins.
3. 1994. Development of Pliocene and Pleistocene chronology of the Turkana Basin, East Africa, and its relation to other sites. In: editors. Integrative paths to the past. Englewood Cliffs, NJ: Prentice Hall. p 285-312.
4. Revision of lithostratigraphic nomenclature in the Koobi Fora region, Kenya
5. A new hominid from the Upper Miocene of Chad, Central Africa