Klakayun, J., and P. Chansirisira. “DEVELOPING GUIDELINES TO ENHANCE TEACHER’ EXPERTISE UNDER NON – FORMAL AND INFORMAL EDUCATION CENTRE IN KALASIN PROVINCE”. Journal of MCU Nakhondhat, vol. 7, no. 8, Aug. 2020, pp. 311-23, https://so03.tci-thaijo.org/index.php/JMND/article/view/246259.