Tumala, Prapasri, Rungson Singhalert, and Deanwichai Sayruksa. 2022. “ Roi-Et Province”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 9 (1):55-70. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/252518.