Thammarak, Kanokrat, Linda Narkpoy, and Saifon Sekkhunthod. 2024. “ADMINISTRATIVE FACTORS AFFECTING THE EFFICIENCY OF INTERNAL SUPERVISION IN SCHOOLS UNDER CHACHOENGSAO PRIMARY EDUCATIONAL SERVICE AREA OFFICE 2”. Journal of Graduate School Sakon Nakhon Rajabhat University 21 (92). Sakon Nakhon, Thailand:38-52. https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/259852.