VILJOEN, A. Education in zoos. Southern African Journal of Environmental Education, [S. l.], v. 9, p. 16–17, 2016. DOI: 10.4314/sajee.v9i0.137533. Disponível em: https://www.ajol.info/index.php/sajee/article/view/137533. Acesso em: 14 oct. 2026.