Pinthong, Pornpatchara, Linda Narkpoy, and Porntip Onkasem. “ADMINISTRATIVE FACTORS AFFECTING THE IMPLEMENTATION OF INTERNAL QUALITY ASSURANCE IN SCHOOLS UNDER THE PROVINCIAL OFFICE OF LEARNING ENCOURAGEMENT IN THE EASTERN REGION”. Journal of Graduate School Sakon Nakhon Rajabhat University 22, no. 99 (December 28, 2025): หน้า 121–136. accessed September 3, 2026. https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/275779.