Sangsuwan, Watcharee, and Komsin Prasongsuk. “THE GUIDELINES FOR INTERNAL QUALITY ASSURANCE OPERATION OF SINGHANATRACHALAI SCHOOL GROUP UNDER MAE HONG SON PRIMARY EDUCATIONAL SERVICE AREA OFFICE 1”. Journal of Graduate School Sakon Nakhon Rajabhat University 23, no. 100 (March 30, 2026): 131–145. accessed October 14, 2026. https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/277327.