Meylia, Safira Arda, et al. “SLEEPING TREE PREFERENCE OF SIAMANG IN THE BUFFER ZONE OF DOLOK SIBUAL-BUALI NATURE RESERVE”. Media Konservasi, vol. 28, no. 2, Aug. 2023, pp. 107-15, https://journal.ipb.ac.id/konservasi/article/view/44702.