Omojola, Awogbemi, et al. “Effect of Usage on the Fatty Acid Composition and Properties of Neat Palm Oil, Waste Palm Oil, and Waste Palm Oil Methyl Ester”. International Journal of Engineering & Technology, vol. 9, no. 1, Feb. 2020, pp. 110-7, https://doi.org/10.14419/ijet.v9i1.29557.