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 2025 Aug. 9];5(2):513-30. available from: https://so07.tci-thaijo.org/index.php/rtnb/article/view/3273