CRAIG, G. Options for aerial surveys of elephants. Pachyderm, [S. l.], v. 16, n. 1, p. 15–20, 1993. DOI: 10.69649/pachyderm.v16i1.750. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/750. Acesso em: 27 apr. 2026.