“Multi-Actor Collaboration in Waste Governance: A Study of Local Government, Private Sector, and Community Engagement in Medan, Binjai, Deli Serdang, and Karo, North Sumatra”. International Journal of Economics Management and Social Science 9, no. 2 (June 4, 2026): 424–435. Accessed July 7, 2026. https://journal.salewangang.net/ijemss/article/view/126.