GIBSON, D.; CRAIG, G.; MASOGO, R. Trends of the elephant population in northern Botswana from aerial survey data. Pachyderm, [S. l.], v. 25, n. 1, p. 14–27, 1998. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/914. Acesso em: 22 jul. 2024.