DU, T. The existing basis for subspecies classification of black and white rhinos. Pachyderm, [S. l.], v. 9, n. 1, p. 3–5, 1987. DOI: 10.69649/pachyderm.v9i1.646. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/646. Acesso em: 28 apr. 2026.