Hartnett DC, Steuter AA, Hickman KR. Comparative ecology of native and introduced ungulates. In: Knopf FL, Samson FB Ecology and Conservation of Great Plains Vertebrates. Ecology and Conservation of Great Plains Vertebrates. New York: Springer-Verlag; 1997:72 -101. doi:10.1007/978-1-4757-2703-6_4.