Promsen, W., O. . Tamasarangkul, and S. Jaita. “Urban Business Model Development for Safe Agricultural Products, Chiang Rai Municipality, Chiang Rai Province”. Area Based Development Research Journal, vol. 14, no. 4, Dec. 2022, pp. 267-82, https://so01.tci-thaijo.org/index.php/abcjournal/article/view/262275.