Meepun, N., and P. . Noparat. “Analysis of Beta-Carotene, Tocopherol and Fatty Acid in Red Palm Oil for Development as Soap Products”. Burapha Science Journal, vol. 29, no. 3 September-December, Nov. 2024, pp. 1047-63, https://li05.tci-thaijo.org/index.php/buuscij/article/view/369.