Tiapibool, P., B. Jittapraphan, and C. Tongsong. “The Development of Green University’s Curriculum of Maejo University –Chumphon”. Social Science Asia, Vol. 4, no. 3, July 2018, pp. 44-55, https://socialscienceasia.nrct.go.th/index.php/SSAsia/article/view/131.