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แสงสว่าง ร. A STUDY OF CORE COMPETENCY OF SCHOOL ADMINISTRATORS UNDER PATHUMTHANI PRIMARY EDUCATIONAL SERVICE AREA OFFICE 2. ptujournal [internet]. 2021 Dec. 29 [cited 2026 Sep. 29];13(2):203-21. available from: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/252314