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Tipburi S, Khumtrup S, Manoonpol K. ADMINISTRATION PROBLEMS AND IMPEDIMENTS FOR ADMINISTRATORS OF PRIVATE KINDERGARTENS SCHOOLS UNDER NONTHABURI PROVINCIAL EDUCATION OFFICE FOLLOWING THAILAND 4.0 POLICY. BSJ [internet]. 2021 Dec. 27 [cited 2026 Oct. 13];6(4):109-23. available from: https://so06.tci-thaijo.org/index.php/BSJ/article/view/252004