Thassopon T, Suthasinee. COMPETENCY OF SCHOOL ADMINISTRATORS IN THE 21ST CENTURY AND HAPPINESS AT WORK OF TEACHERS UNDER THE MUNICIPALITY IN SAMUT SAKHON PROVINCE. JMND [internet]. 2024 Jan. 31 [cited 2025 Dec. 10];11(1):271-8. available from: https://so03.tci-thaijo.org/index.php/JMND/article/view/274507