“Analisis Program Konservasi Orangutan Sumatera Oleh Yayasan Orangutan Sumatera Lestari Di Kabupaten Langkat”. Journal of Future Social Humanities and Cultural Evolution 1, no. 2 (June 23, 2026): 332–344. Accessed August 22, 2026. https://ejournal.lppnusantara.com/index.php/jfshe/article/view/920.