Suandong, Thanyaphat, Jaras Leeka, and Suwin Thongpan. 2019. “Synthesis of Ethical Theory As a Basis of the Hotel Business”. Journal of Graduate MCU KhonKaen Campus 6 (1):289-99. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/243672.