Nopper, J.; Gonwouo, L. N.; Hillers, A.; Sandberger, L.; Ohler, A.; Rödel, M.-O.

New Data on the Distribution and Morphology of the West African Squeaker Frog Arthroleptis langeri Rödel, Doumbia, Johnson & Hillers, 2009 (Amphibia: Anura: Arthroleptidae)

. Zootaxa 2012, 3170, 64–68.