Naksanee, Tassanee. 2019. “The Guidelines for Health Tourism Development in the Western Region for the Senior Thai Tourists”. Muban Chombueng Rajabhat University Research Journal (Humanities and Social Science) 7 (1). Ratchaburi, Thailand:1-19. https://so03.tci-thaijo.org/index.php/hssj/article/view/248346.