Omoruyi, Sylvester I., et al. “Preliminary Cytotoxic Activity of Sutherlandia Frutescens and Carpobrotus Edulis on Malignant Glioblastoma Cells: doi.org 10.26538 Tjnpr V3i5.5”. Tropical Journal of Natural Product Research (TJNPR), vol. 3, no. 5, May 2019, pp. 175-9, https://tjnpr.org/index.php/home/article/view/1711.