Nootawee N, Chanakul B, Temrat S. ADMINISTRATOR’S COMPETENCIES AFFECTING ACHIEVEMENT OF SCHOOLS UNDER THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE SURATTHANI CHUMPHON. JMND [internet]. 2024 Jan. 29 [cited 2026 Sep. 11];11(1):70-81. available from: https://so03.tci-thaijo.org/index.php/JMND/article/view/274690