Vanzolini PE, Gomes N. A note on the biometry and reproduction of Podocnemis sextuberculata (Testudines, Pelomedusidae). Pap. Avulsos Zool. 1979;32(1-23 (1978-1979):277-290. doi:10.11606/0031-1049.1979.32.p277-290