Kengpol, Athakorn, Thanyathip Pichitkarnkar, and Kalle Elfvengren. “A Decision Support System for Consumer Behavior of Chinese In-bound Tourists on Functional Beverage: An Empirical Study during COVID-19 with Thailand Sandbox”. Applied Science and Engineering Progress 15, no. 1 (October 20, 2021). accessed April 18, 2025. https://ph02.tci-thaijo.org/index.php/ijast/article/view/245626.