Liamsuwan, C., S. Phongsamran, and T. Mahamud. “MOTIVATIONAL FACTORS AFFECTING JOB MORALE OF EMPLOYEES IN MDX PUBLIC COMPANY LIMITED”. RMUTT GLOBAL BUSINESS ACCOUNTING AND FINANCE REVIEW, vol. 3, no. 2, Aug. 2019, pp. 1-11, https://so01.tci-thaijo.org/index.php/GBAFR/article/view/253180.