O. Adeluola, Adebowale, et al. “Processing and Evaluation of Locally Sourced Kaolin for Pharmaceutical Production: doi.org 10.26538 Tjnpr V2i8.4”. Tropical Journal of Natural Product Research (TJNPR), vol. 2, no. 8, Aug. 2018, pp. 388-95, https://tjnpr.org/index.php/home/article/view/809.