Supnui, Kanjana, Prasong Tanpichai, and Weerachat Soopunyo. 2013. “The Development of Training Curriculum on Leadership in Agricultural and Environmental Education Activities Using a University’s Farm As a Learning Resource”. Kasetsart Journal of Social Sciences 34 (2):255-68. https://so04.tci-thaijo.org/index.php/kjss/article/view/246945.