Srakaew, P., P. Srisopachit, N. Krimjai, and C. Deesukanan. “Relationship of Causal Factors Toward Competitive Advantage of Small and Medium-Size Hotel Business in Thailand”. Ph.D. In Social Sciences Journal, vol. 9, no. 2, Aug. 2019, pp. 420-37, https://so05.tci-thaijo.org/index.php/phdssj/article/view/119459.