HARTLEY, M.; STANLEY, C. Survey of Reproduction and Calf Rearing in Asian and African Elephants in Europe. Journal of Zoo and Aquarium Research, [S. l.], v. 4, n. 3, p. 139–146, 2016. DOI: 10.19227/jzar.v4i3.161. Disponível em: https://jzar.org/jzar/article/view/161. Acesso em: 19 jan. 2022.