ชัยคินี สถาพร. “THE GUIDELINE DEVELOPMENT OF THE SANITATION’S SCHOOL PROCESS FOR SCHOOL UNDER THE OFFICE OF BUENGKAN EDUCATIONAL SERVICE AREA”. Journal of Graduate School Sakon Nakhon Rajabhat University 15, no. 69 (July 6, 2018): 97–108. accessed September 23, 2026. https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/75385.