Collar, N. J.; Butchart, S. H. M. 2013. Conservation breeding and avian diversity: chances and challenges. International Zoo Yearbook 48(1): 7-28.
Collar, N. J.; Mallari, N. A. D.; Tabaranza, B. R. J. 1999. Threatened birds of the Philippines: the Haribon Foundation/BirdLife International Red Data Book. Bookmark, Makati City.
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Recommended citation
BirdLife International (2024) Species factsheet: Philippine Eagle-owl Bubo philippensis. Downloaded from
https://datazone.birdlife.org/species/factsheet/philippine-eagle-owl-bubo-philippensis on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 22/12/2024.