JOHNSTONE, Jill; RUSSELL, Donald E.; GRIFFITH, Brad. Variations in plant forage quality in the range of the Porcupine caribou herd. Rangifer, Tromsø, Norway, v. 22, n. 1, p. 83–91, 2002. DOI: 10.7557/2.22.1.693. Disponível em: https://septentrio.uit.no/index.php/rangifer/article/view/693. Acesso em: 7 may. 2026.