kasemsan ว. ., and Thampayak อ. . “The Efficiency of Learning Experience on the Testing of Total Polar Compounds in Repeatedly Used Cooking Oil”. Journal of Vocational Institute of Agriculture, vol. 5, no. 2, Dec. 2021, pp. 49-58, https://li01.tci-thaijo.org/index.php/JVIA/article/view/250911.