Astuti, Tri, and Marulam MT Simarmata. “Participation and Community Motivation to Protect the Forest Park Tahura of Bukit Barisan”. International research journal of management, IT and social sciences 7, no. 5 (August 10, 2020): 78–88. Accessed July 16, 2024. https://sloap.org/journals/index.php/irjmis/article/view/973.