Hillers, A., B. Zimkus, and M.-O. Rödel. “A New Species of Phrynobatrachus (Amphibia: Anura: Phrynobatrachidae) from North-Western Guinea, West Africa”. Zootaxa, vol. 1815, no. 1, July 2008, pp. 43–50, doi:10.11646/zootaxa.1815.1.4.