Tumala, P., R. . Singhalert, and D. . Sayruksa. “ Roi-Et Province”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 9, no. 1, Feb. 2022, pp. 55-70, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/252518.