Essilfie, M. E., H. K. Dapaah, J. Ofosu-Anim, E. T. Blay, and J. C. Norman. “Assessment of Changes in Beta-Carotene Content and Sensory Attributes of Two Sweet Potato Varieties As Influenced by Organic and Inorganic Fertilizers and Storage Methods”. Recent Advances in Biological Research Vol. 2, July 2019, pp. 144-5, https://stm1.bookpi.org/index.php/rabr-v2/article/view/196.