WIDDMAN, Peter; LACERNA, Indira D.; DIAZ, Siegfred H. Aspects of Biology and Conservation of the Philippine Cockatoo Cacatua Haematuropygia on Rasa Island, Palawan, Philippines. Silliman Journal, Dumaguete, Philippines, v. 42, n. 2, 2022. Disponível em: https://su-journal.su.edu.ph/index.php/sj/article/view/238. Acesso em: 9 mar. 2026.