PILGRAM, T.; WESTERN, D. Managing African elephants for ivory production. Pachyderm, [S. l.], v. 4, n. 1, p. 9–11, 1984. DOI: 10.69649/pachyderm.v4i1.596. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/596. Acesso em: 3 may. 2026.