Purwani, Tri, and Muhammad Irfan. “Economic Value of Bukittinggi City Regional Public Library: Travel Cost Approach and Contingency Valuation”. Journal of Economic Education and Entrepreneurship Studies 7, no. 5 (October 27, 2026): 287–302. Accessed October 29, 2026. https://journal.feb-unm.com/index.php/JE3S/article/view/611.