Thi Thu Ha, T., and N. Triana. “ECONOMIC VALUE ASSESMENT OF THE SUMATRAN TIGER: AN APPLICATION OF CONTINGENT VALUATION METHOD IN GUNUNG LEUSER NATIONAL PARK, INDONESIA”. Journal of Forestry Science and Technology, no. 10, Dec. 2020, pp. 138-4, https://journal.vnuf.edu.vn/en/article/view/595.