Perwitasari-Farajallah, Dyah. “Discrimination of Two Species of Orangutans (Pongo sp.): A Rapid Protocol for Rehabilitation Centres and Zoos”. BIOTROPIA 16, no. 2 (January 11, 2024). Accessed December 22, 2024. https://journal.biotrop.org/index.php/biotropia/article/view/52.