Sihathep, Noukai, Vonvalay Inbounmy, and Chanthasone Vannavong. “Behavior and Willingness to Pay of Foreign Tourists for the Fee to Visit the Vat Phou Champasak World Heritage ”. Champasack University Scientific Journal 3, no. 3 (July 3, 2018): 50–58. Accessed August 26, 2026. http://cu-journal.com/index.php/files/article/view/25.