Balemi, S., and E. Bekele. “Variations in Tasting Phenylthiocarbamide (PTC) in Selected Individuals from Ethiopia: Implications for Human Health”. Ethiopian Journal of Education and Sciences, Vol. 15, no. 2, Nov. 2020, pp. 45-55, https://ejhs.ju.edu.et/index.php/ejes/article/view/2407.