Muthengi, A., S. Njiru, and J. Mungiria. “A Comparative Study of Caffeine Levels in Coffee and Cocoa in Kenyan Supermarkets and Shops”. Pan-African Journal of Health and Environmental Science, vol. 3, no. 1, July 2024, pp. 1-11, doi:10.56893/ajhes2024v03i01.01.