Nopper, J., Gonwouo, L.N., Hillers, A., Sandberger, L., Ohler, A. and 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 (Jan. 2012), 64–68. DOI:https://doi.org/10.11646/zootaxa.3170.1.6.