Humphries, Marc S., Terrence S. McCarthy, and Letitia Pillay. “Attenuation of Pollution Arising from Acid Mine Drainage by a Natural Wetland on the Witwatersrand”. South African Journal of Science 113, no. 1/2 (January 30, 2017): 9. Accessed April 25, 2024. https://sajs.co.za/article/view/3589.