Tunyaporn Sirilert, Anuvat Jangchud, Phaisan Wuttijumnong, and Kamolwan Jangchud. “Effect of Coating on Doughnut Cake Preference using R-index”. Agriculture and Natural Resources 40, no. 1 (February 28, 2006): 240–246. accessed April 10, 2025. https://li01.tci-thaijo.org/index.php/anres/article/view/243555.