Arista, Sundari Anda, and Endah Saptutyningsih. “Estimation of Willingness to Pay for Development and Preservation of Liwa Botanical Garden Indonesia”. Journal of Economics Research and Social Sciences 4, no. 2 (December 8, 2020): 118–128. Accessed September 4, 2025. https://journal.umy.ac.id/index.php/jerss/article/view/10103.