Choosiangjeaw , K. . . ., and S. . . Ragmai. “Competencies and Service Quality of Room Attendants: A Case Study of Hotels in Trang Province”. Dusit Thani College Journal, vol. 13, no. 2, Apr. 2020, pp. 167-83, https://so01.tci-thaijo.org/index.php/journaldtc/article/view/241062.