Russell, Don E., Art M. Martell, and Wendy A. C. Nixon. “Range Ecology of the Porcupine Caribou Herd in Canada”. Rangifer 13, no. 5 (December 1, 1993): 1–168. Accessed May 27, 2024. https://septentrio.uit.no/index.php/rangifer/article/view/1057.