Buacharoen, P., and P. Buochareon. “Quality Assurance of Rajamangala University of Technology Lanna”. RMUTL Journal of Business Administration and Liberal Arts, vol. 6, no. 2, Dec. 2018, pp. 1-10, https://so05.tci-thaijo.org/index.php/balajhss/article/view/164127.