ลี้ตระกูล ปวีณา. “Tourism and Income Distribution in Chiang Rai Province”. Journal of Management Science Chiangrai Rajabhat University 6, no. 2 (June 6, 2018): 91–116. Accessed May 17, 2024. https://so03.tci-thaijo.org/index.php/jmscrru/article/view/127334.