MARTIN, E.; RYAN, T. How much rhino horn has come onto international markets since 1970?. Pachyderm, [S. l.], v. 13, n. 1, p. 20–25, 1990. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/701. Acesso em: 22 jul. 2024.