Susanto, A. B. “The Effect Of Government Policy And Environmental Sustainability On The Performance Of Tourism Business Competitiveness: Empirical Assessment On The Reports Of International Tourism Agencies”. International Journal of Energy Economics and Policy, vol. 9, no. 6, Oct. 2019, pp. 439-46, https://www.econjournals.com/index.php/ijeep/article/view/8297.