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. Auckland, New Zealand, 3635(3), pp. 201–223. doi: 10.11646/zootaxa.3635.3.1.