Rodrigues, J., Soares, D. and Silva, J. 2014. Sexing freshwater turtles: penile eversion in <em>Phrynops tuberosus</em> (Testudines: Chelidae). Acta Herpetologica. 9, 2 (Nov. 2014), 259–263. DOI:https://doi.org/10.13128/Acta_Herpetol-14736.