(APICHIT NGAMKOM), P. B. SYSTEMIC STUDENT LEADERSHIP DEVELOPMENT FOR ENHANCING LEARNER QUALITY: A CONCEPTUAL FRAMEWORK FOR SCHOOLS UNDER THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE NAKHON SI THAMMARAT. Journal of MCU Nakhondhat, Nakhon Si Thammarat, Thailand, v. 13, n. 10, p. 341–350, 2026. Disponível em: https://so03.tci-thaijo.org/index.php/JMND/article/view/304661. Acesso em: 1 oct. 2026.