สุวิภาต ณ., and ประกอบผล ธ. “JOB CHARACTERISTICS AND JOB MOTIVATION OF OPERATIONAL EMPLOYEES IN PYLON PUBLIC COMPANY LIMITED”. Journal of Industrial Education, vol. 15, no. 3, Dec. 2016, pp. 121-9, https://ph01.tci-thaijo.org/index.php/JIE/article/view/122759.