H. P. . Subakti, J. Master, S. Umar, and A. Subagio, “Distribution and Density Estimation of Siamang (Symphalangus syndactylus) in Way Rilau Block, Way Sekampung Resort, Batutegi Protection Forest, Lampung Province”, LenteraBio, vol. 15, no. 1, pp. 94–102, Apr. 2026.