Phulukdaree, Alisa, et al. “The Effects of Sutherlandia Frutescens Extracts in Cultured Renal Proximal and Distal Tubule Epithelial Cells”. South African Journal of Science, vol. 106, no. 1/2, Mar. 2010, pp. 54-58, https://sajs.co.za/article/view/10189.