Nopper, J., Gonwouo, L.N., Hillers, A., Sandberger, L., Ohler, A. & Rödel, M.-O. (2012)

New data on the distribution and morphology of the West African squeaker frog Arthroleptis langeri Rödel, Doumbia, Johnson & Hillers, 2009 (Amphibia: Anura: Arthroleptidae)

. Zootaxa, 3170 (1), 64–68.