Kays, R., Allison, A., 2001. Arboreal Tropical Forest Vertebrates: Current Knowledge and Research Trends, in: Linsenmair, K., Davis, A., Fiala, B., Speight, M. (Eds.), Tropical Forest Canopies: Ecology and ManagementKluwer Academic Publishers. pp. 109-120. doi:10.1007/978-94-017-3606-0_9

Kays, R., 2001. Kinkajou, in: MacDonald, D. (Ed.), The Encyclopedia of MammalsOxford University Press, Oxford. pp. 92-93.

Kays, R., 2001. Olingos, in: MacDonald, D. (Ed.), The Encyclopedia of MammalsOxford University Press, Oxford. pp. 94.

Kays, R., 2001. Ringtail and Cacomistle, in: MacDonald, D. (Ed.), The Encyclopedia of MammalsOxford University Press, Oxford. pp. 95.

Kays, R., Bogan, D., 2003. Coyote, in: Barnes, J. (Ed.), Natural History of the Albany Pine BushThe University of the State of New York, Albany, New York. pp. 161-162.

Kays, R., Bogan, D., 2003. Fisher, in: Barnes, J. (Ed.), Natural History of the Albany Pine BushThe University of the State of New York, Albany, New York. pp. 164.

Kays, R., 2003. Social Polyandry and Promiscuous Mating in a Primate-like Carnivore: the Kinkajou (Potos flavus), in: Reichard, U., Boesch, C. (Eds.), Monogamy: Mating Strategies and Partnerships in Birds, Humans and Other MammalsCambridge University Press, Cambridge, United Kingdom. pp. 125-137.

Pickering, J., Kays, R., Meier, A., Andrew, S., Yatskievych, K., Brooks, T., Konstant, W., 2002. Appalachian Mountain Wilderness, in: Mittermeier, R., Mittermeier, C., Gil, P., Pilgrim, J., Fonseca, G. (Eds.), Wilderness: Earth’s Last Wild PlacesConservation International, Washington, D.C..

Kays, R., Daniels, R., Mitchell, R., Molloy, D., Siegfried, C., 2005. Exotic Species, in: Eisenstadt, P., Moss, L. (Eds.), The Encyclopedia of New York StateSyracuse University Press, Syracuse, NY. pp. 538-539.

Macdonald, D.W., Kays, R., 2005. The Carnivora: The Evolution, Adaptive Significance and Conservation of Their Diversity, in: Nowak, R. (Ed.), Walkers Carnivores of the WorldJohns Hopkins University Press, Baltimore, Maryland.