Widdman, Peter, Indira D. Lacerna, and Siegfred H. Diaz. “Aspects of Biology and Conservation of the Philippine Cockatoo Cacatua Haematuropygia on Rasa Island, Palawan, Philippines”. Silliman Journal 42, no. 2 (November 10, 2022). Accessed November 23, 2024. https://sillimanjournal.su.edu.ph/index.php/sj/article/view/238.