Chumphong, O., and P. Chuai-in. “The Use of English Language in Tourism Workplaces in Pakmeng Beach Area, Trang Province”. ABAC ODI JOURNAL Vision. Action. Outcome, vol. 7, no. 1, Jan. 2020, pp. 132-44, http://www.assumptionjournal.au.edu/index.php/odijournal/article/view/4029.