Jongkroy, Puntip, and Chonmani Thongbai. “The Potentials and Limitations, and Specialization of Regional Cities in Thailand”. Kasetsart Journal of Social Sciences 40, no. 2 (August 30, 2019): 440–447. Accessed May 8, 2024. https://so04.tci-thaijo.org/index.php/kjss/article/view/242180.