SUSILAWATI SS, Fauzi A, Kusmana C, Santoso N. Strategy and policy in the management of Sumatran Orangutan (Pongo abelii) conservation tourism on the Lawang Hill in the Langkat district of North Sumatera. JPSL [Internet]. 2020 Mar. 20 [cited 2026 Jan. 12];10(1):1-11. Available from: https://journal.ipb.ac.id/jpsl/article/view/28098