Maree, J., A. Viljoen, and M. Manley. 2009. “DEVELOPMENT OF A QUALITY CONTROL PROTOCOL FOR PELARGONIUM SIDOIDES USING NEAR INFRARED SPECTROSCOPY (NIRS)”. African Journal of Traditional, Complementary and Alternative Medicines 6 (May):416-17. https://journals.athmsi.org/index.php/ajtcam/article/view/817.