Promsen, Waewdao, Orasa Tamasarangkul, and Subin Jaita. 2022. “Urban Business Model Development for Safe Agricultural Products, Chiang Rai Municipality, Chiang Rai Province”. Area Based Development Research Journal 14 (4):267-82. https://so01.tci-thaijo.org/index.php/abcjournal/article/view/262275.