[1]
P. E. Vanzolini, “Notes on the nesting behaviour of Podocnemis expansa in the Amazon valley (Testudines, Pelomedusidae)”, Pap. Avulsos Zool., vol. 20, no. 1-21, pp. 191–215, Jul. 1967, doi: 10.11606/0031-1049.1967.20p191-215.