Bao , B. M. ., and L. W. . Fweja. “Evaluation of the Potential of Freshly Bred Orange-Fleshed Sweet Potato Varieties in Combating Vitamin A Deficiency”. Tanzania Journal of Science, vol. 46, no. 1, Mar. 2020, pp. 1-8, https://tjs.udsm.ac.tz/index.php/tjs/article/view/86.