Rödel, M.-O., C. O. Boateng, J. Penner, and A. Hillers. “A New Cryptic Phrynobatrachus Species (Amphibia: Anura: Phrynobatrachidae) from Ghana, West Africa”. Zootaxa, vol. 1970, no. 1, Jan. 2009, pp. 52–63, doi:10.11646/zootaxa.1970.1.2.