จิตต์โสภณ ค. ., & ธุวดาราตระกูล ส. . . (2020). Factors Affecting the Loyalty of the Farmers Growing Oil Palms towards Crude Palm Oil Extraction Plants in the Upper Southern Thailand . Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University, 15(3), 23–37. Retrieved from https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/245964