Harnmontha, C., and S. Tuvadaratragool. “Factors Affecting Thai Tourists’ Decision Making on Touring the Southern Upper Part of Thailand”. Rajapark Journal, vol. 16, no. 48, Oct. 2022, pp. 321-30, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/258270.