Klahan, Adisorn, and Sunthon Kohtbantau Sunthon Kohtbantau. 2022. “Operations of Internal Supervision of Schools in Doem Bang Nang Buat District, Suphan Buri Province”. Journal for Developing the Social and Community 9 (3). Bangkok, Thailand:427-38. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/256100.