Klangson, R., Pakdeejit, Y. . and Cha-umpong, T. . (2023) “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 . Nakhon Sawan,Thailand, 6(3), pp. 174–187. doi: 10.2774.EDU2023.3.261806.