Petzold, A., Vargas-Ramírez, M., Kehlmaier, C., Vamberger, M., Branch, W.R., Preez, L.D., Hofmeyr, M.D., Meyer, L., Schleicher, A., Široký, P. & Fritz, U. (2014) A revision of African helmeted terrapins (Testudines: Pelomedusidae: Pelomedusa), with descriptions of six new species. Zootaxa, 3795 (5), 523–548.