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Poonsawat A, Sonchan C. Integrative Leadership of School Administrators Affecting to 21st Century Learning Skills of School Under Secondary Educational Service Area Office Loei Nong Bua Lam Phu: Integrative Leadership of School Administrators Affecting to 21st Century Learning Skills of School Under Secondary Educational Service Area Office Loei Nong Bua Lam Phu. rtnb [Internet]. 2023 Aug. 31 [cited 2024 Feb. 24];5(2):513-30. Available from: https://so07.tci-thaijo.org/index.php/rtnb/article/view/3273