Fachín-Terán, A. and Vogt, R.C. (2004) “Population structure, size and sex ratio in Podocnemis unifilis (Testudines, Podocnemididae) in the Guaporé river (RO), northern Brazil”, Phyllomedusa: Journal of Herpetology, 3(1), pp. 29–42. doi:10.11606/issn.2316-9079.v3i1p29-42.