Someran, L., S. Supaphol, and N. Sukjai. “Organizational culture factors and working environment factors that affect the work efficiency of employees of Sermsuk Public Company Limited”. Rajamangala University of Technology Tawan-ok Social Science Journal, vol. 10, no. 1, June 2021, pp. 76-85, https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/247835.