Arda Meylia, Safira, dan Abdul Haris Mustari. “Distribution, Population, and Habitat of Siamang (Symphalangus Syndactylus) in Bulu Mario, South Tapanuli”. Jurnal Penelitian Hutan dan Konservasi Alam 19, no. 1 (Juni 30, 2022): 101–118. Diakses April 18, 2026. https://ejournal.aptklhi.org/index.php/JPHKA/article/view/616.