Abdullah, N. I., Dharmalingam, S. ., & Md- Zain, B. M. . (2021). A Behavioral Study on the Bornean Orangutan (Pongo pygmaeus) in a Semi-wild Environment at Bukit Merah Orang Utan Island, Perak. Journal of Sustainable Natural Resources, 2(2), 22-30. https://publisher.uthm.edu.my/ojs/index.php/jsunr/article/view/10206