Y. Santosa and D. A. Rahman, “Precision of Nest Method in Estimating Orangutan Population and Determination of Important Ecological Factors for Management of Conservation Forest”, J Man Hut Trop, vol. 18, no. 1, pp. 39–51, Apr. 2012, Accessed: Jan. 12, 2026. [Online]. Available: https://journal.ipb.ac.id/jmht/article/view/4743