Jati, Fajar Sanintan, I Made Oka Riawan, and Moh Jafron Syah. “Feeding Behavior and Food Preferences of Bornean Orang Utan (Pongo Pygmaeus) at Gembira Loka Zoo Yogyakarta”. Jurnal Biologi Tropis 25, no. 4 (October 7, 2025): 5247–5256. Accessed October 8, 2025. https://jurnalfkip.unram.ac.id/index.php/JBT/article/view/10098.