Kesuma, Sandry, Akhmad Sabarudin, and Siti Mariyah Ulfa. “Determination of Vitamin A and Vitamin E Contents in Fortified Cooking Oil Using Visible Spectrophotometry”. Asian Journal of Chemistry 32, no. 3 (January 31, 2020): 565–569. Accessed November 24, 2024. https://asianpubs.org/index.php/ajchem/article/view/32_3_14.