Depari, Brian Pratama, Zulkifli Nasution, and Nurzainah Ginting. “Evaluation of Handling Waste System in Doulu Tourist Area, Karo Regency, Indonesia”. Journal of Environmental and Development Studies 4, no. 01 (May 16, 2023): 018–026. Accessed June 19, 2026. https://idjpcr.usu.ac.id/jeds/article/view/10416.