COLLINS, Williams B.; SMITH, Thomas S. Twenty-four hour behaviour patterns and budgets of free-ranging reindeer in winter. Rangifer, Tromsø, Norway, v. 9, n. 1, p. 2–8, 1989. DOI: 10.7557/2.9.1.766. Disponível em: https://septentrio.uit.no/index.php/rangifer/article/view/766. Acesso em: 3 may. 2026.