Thaithong, Nisarat, Chuleewan Praneetham, Matthew Noades, and Prasert Sitthijirapat. 2018. “Competency Development of the Hotel Staff in Koh Samui, Surat Thani Province”. Chophayom Journal 29 (3):41-54. https://so01.tci-thaijo.org/index.php/ejChophayom/article/view/163906.