Sihabutr, C. “Knowledge of Sustainable Tourism and Environmental Awareness: Luang Prabang, Laos PDR”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences, vol. 35, no. 3, June 2019, pp. 14-28, https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/195550.