Tarrant, J., M. J. Cunningham, and L. H. D. Preez. “Maluti Mystery: A Systematic Review of Amietia Vertebralis (Hewitt, 1927) and Strongylopus Hymenopus (Boulenger, 1920) (Anura: Pyxicephalidae)”. Zootaxa, vol. 1962, no. 1, Dec. 2008, pp. 33–48, doi:10.11646/zootaxa.1962.1.2.