Muthengi, Alex, Silas Njiru, and Juster Mungiria. “A Comparative Study of Caffeine Levels in Coffee and Cocoa in Kenyan Supermarkets and Shops”. Pan-African Journal of Health and Environmental Science 3, no. 1 (July 2, 2024): 1–11. Accessed December 21, 2024. https://journals.aua.ke/ajhes/article/view/485.