R. Grandez R., M. Raffael A., C. Hermoza G., and R. Valencia L., “Study of the radiographic osteology of the pipa frog (Pipa pipa)”, Rev. investig. vet. Perú, vol. 29, no. 1, pp. 84–94, Mar. 2018, doi: 10.15381/rivep.v29i1.14206.