Panbamrungkij, T., and T. Swangchan-Uthai. “Factors Associated With Tourism Growth and Travelers’ Motivations: The Case of Savannakhet Province, Lao PDR”. Journal of Mekong Societies, vol. 17, no. 3, Dec. 2021, pp. 45-76, https://so03.tci-thaijo.org/index.php/mekongjournal/article/view/249874.