Smathanares, B., C. Wana, and S. Vatcharajit. “The Competitive Advantage Strategies of Small and Medium Sized Hotels in Bangkok”. Ph.D. In Social Sciences Journal, vol. 9, no. 3, Dec. 2019, pp. 584-98, https://so05.tci-thaijo.org/index.php/phdssj/article/view/141127.