1. THE COMPOSITION OF THE MILK OF WILD ANIMALS
2. : Preliminary findings on the behavioral budgeting of two okapi calves (Okapia johnstoni) during the first six months of life. Pp. 751-759 in Proceedings of the american association of zoological parks and aquariums regional conference, 1989.
3. : Mother-infant relationships and the behavioral budgeting of four okapi (Okapia johnstoni) calves during the first six months of life. Paper presented at the Animal Behavior Society Annual Meeting, Wilmington, North Carolina, 1991.
4. : Behavioral development and mother-infant relations in the forest giraffe (Okapia johnstoni). Pp. 33-53 in Zoom Op Zoo. Royal Society of Antwerp, Belgium, 1985.