Jantub, S., Cha-umpong, T. ., & Pakdeejit, Y. . (2023). Factors Affecting Internal Quality Assurance Operation in Schools under the Secondary Educational Service Area Office Nakhonsawan. Education journal Faculty of Education, Nakhon Sawan Rajabhat University, 6(2), 194–207. https://doi.org/10.2774.EDU2023.2.260651