1. Demography of Amboseli baboons, 1963-1983
2. : Effects of Habitat Disturbance on the Behavioral Ecology and Demographics of the Tana River Red Colobus, Colobus Badius Rufomitratus. Ph.D. dissertation, Emory University, Atlanta, GA, 1989.
3. : The Ecology and Behaviour of the Tana Mangabey. Ph.D. dissertation, University College, London, UK, 1976.
4. Feeding strategy of the Tana mangabey (Cercocebus galeritus galeritus) (Mammalia: Primates)
5. : Behavioral and Demographic Responses to Habitat Change By the Tana River Crested Mangabey (Cercocebus Galeritus Galeritus). Ph.D. dissertation, University of Florida, Gainesville, FL, 1990.