Conradie, Werner, William R. Branch, and Krystal A. Tolley. “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, no. 3 (March 27, 2013): 201–223. Accessed May 3, 2025. https://www.mapress.com/zt/article/view/zootaxa.3635.3.1.