Phumang, Nartchanok, and Pacharawit Chansirisira. 2020. “THE DEVELOPMENT OF GUIDELINE TO STRENGTHEN TEACHERS’ COMPETENCY OF LEARNING MANAGEMENT IN SCHOOLS UNDER THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE 26”. Journal of MCU Nakhondhat 7 (6). Nakhon Si Thammarat, Thailand:323-37. https://so03.tci-thaijo.org/index.php/JMND/article/view/244551.