WILLIAMS, T. Mark; HEARD, Douglas C. World status of wild Rangifer tarandus populations. Rangifer, Tromsø, Norway, v. 6, n. 2, p. 19–28, 1986. DOI: 10.7557/2.6.2.553. Disponível em: https://septentrio.uit.no/index.php/rangifer/article/view/553. Acesso em: 3 may. 2026.