Maneasa, Edyson, Suddin Simandjuntak, and Yermia Semuel Mokosuli. “Density of The Crested Black Macaque (Macaca Nigra) and Habitat Quality in Tangkoko, Bitung, North Sulawesi”. Jurnal Biologi Tropis 21, no. 2 (July 19, 2021): 587–592. Accessed February 5, 2023. https://jurnalfkip.unram.ac.id/index.php/JBT/article/view/2789.