Kareru, P. G., J. M. Keriko, A. N. Gachanja, and G. M. Keni. “DIRECT DETECTION OF TRITERPENOID SAPONINS IN MEDICINAL PLANTS”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 5, no. 1, Sept. 2007, pp. 56-60, https://athmsi.org/journals/index.php/ajtcam/article/view/325.