Gashawa, Alemayehu, and Tewodros Getachew. “The Chemistry of Khat and Adverse Effect of Khat Chewing”. American Scientific Research Journal for Engineering, Technology, and Sciences 9, no. 1 (July 21, 2014): 35–46. Accessed September 12, 2025. https://asrjetsjournal.org/American_Scientific_Journal/article/view/633.