Schrader, Aljoscha, and Frank Winde. “Unearthing a Hidden Treasure: 60 Years of Karst Research in the Far West Rand, South Africa”. South African Journal of Science 111, no. 5/6 (May 28, 2015): 1–7. Accessed May 3, 2024. https://sajs.co.za/article/view/3630.