Klangson, R., Y. . Pakdeejit, and T. . Cha-umpong. “A Study on Internal Quality Assurance Management Problems of Small School under Phichit Primary Educational Service Area Office 1”. Education Journal Faculty of Education, Nakhon Sawan Rajabhat University, vol. 6, no. 3, Dec. 2023, pp. 174-87, doi:10.2774.EDU2023.3.261806.