Conradie, W., Branch, W.R. and Tolley, K.A. 2013. Fifty Shades of Grey: giving colour to the poorly known Angolan Ashy reed frog (Hyperoliidae: Hyperolius cinereus), with the description of a new species. Zootaxa. 3635, 3 (Mar. 2013), 201–223. DOI:https://doi.org/10.11646/zootaxa.3635.3.1.