Harichai P, Nualsing T. COMPETENCIES OF SCHOOL PRINCIPALS AFFECTING TEACHING EFFICIENCY OF TEACHERS UNDER YASOTHON PRIMARY EDUCATION SERVICE AREA OFFICE 2. AJMBU [Internet]. 2023 Dec. 27 [cited 2024 May 15];12(2):210-21. Available from: https://so01.tci-thaijo.org/index.php/AJMBU/article/view/270086