Suharyono, Suharyono, and Kumba Digdowiseiso. “The Effects of Environmental Quality on Indonesia’s Inbound Tourism”. International Journal of Energy Economics and Policy 11, no. 1 (December 1, 2020): 9–14. Accessed December 23, 2024. https://mail.econjournals.com/index.php/ijeep/article/view/10526.