“Distribution and Population of Siamang (Symphalangus Syndactylus Raffles, 1821) in KHDTK Aek Nauli, North Sumatera”. Indonesian Journal of Primatology 3, no. 01 (February 10, 2025): 29–36. Accessed December 24, 2025. https://journal.ipb.ac.id/primatology/article/view/53313.