R. Crabtree and S. Sheldon, «The Ecological Role of Coyotes on Yellowstone's Northern Range,» in Carnivores in Ecosystems: The Yellowstone Experience, eds. T. W. Clark, A. P. Curlee, S. C. Minta, and P. M. Kareiva (New Haven, CT: Yale University Press, 1999), 127–163.