DJ Ollis, JL Ewart-Smith, JA Day, NM Job, DM Macfarlane, CD Snaddon, EJJ Sieben, JA Dini, and N Mbona. “The Development of a Classification System for Inland Aquatic Ecosystems in South Africa”. Water SA, vol. 41, no. 5 October, Oct. 2015, doi:10.4314/wsa.v41i5.16.