Khunthong, Sinjai, Warangkana Sungsitthisawad, and Sutin Chanabun. 2023. “The Environmental Health Conditions and Factors Associated With Preventive Behaviors of Covid-19 Disease by Hotel Staff in Chiang Khan District, Loei Province”. Journal of Medicine and Public Health, Ubon Ratchathani University 6 (1):25-34. https://he01.tci-thaijo.org/index.php/jmpubu/article/view/257918.