SCOTT, E.; VISSER, J. D.; YETMAN, C. A.; YETMAN, C. A.; OLIVER, L.; BROADLEY, D. G. Revalidation of Pyxicephalus angusticeps Parry, 1982 (Anura: Natatanura: Pyxicephalidae), a bullfrog endemic to the lowlands of eastern Africa. Zootaxa, Auckland, New Zealand, v. 3599, n. 3, p. 201–228, 2013. DOI: 10.11646/zootaxa.3599.3.1. Disponível em: https://mapress.com/zt/article/view/zootaxa.3599.3.1. Acesso em: 20 apr. 2025.