Johnstone, Jill, Donald E. Russell, and Brad Griffith. “Variations in plant forage quality in the range of the Porcupine caribou herd”. Rangifer 22, no. 1 (June 1, 2002): 83–91. Accessed April 13, 2024. https://septentrio.uit.no/index.php/rangifer/article/view/693.