WILLIAMS, T. M.; HEARD, D. C. World status of wild Rangifer tarandus populations. Rangifer, [S. l.], 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: 26 may. 2022.