Unapak, P., W. . Wongwatkasem, and S. . Romsri. “Administrative Conditions of Registration and Measurement Educational Institutions under Provincial Administrative Organization of Ubon Ratchathani Province”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 9, no. 3, Dec. 2022, pp. 665-78, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/265406.