Ngcobo, M., N. Gqaleni, P. K. Chelule, M. Serumula, and A. Assounga. “EFFECTS OF SUTHERLANDIA FRUTESCENS EXTRACTS ON NORMAL T-LYMPHOCYTES IN VITRO”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 9, no. 1, Aug. 2011, pp. 73-80, https://journals.athmsi.org/index.php/ajtcam/article/view/1388.