Cita APA (7th ed.)

Collar, N., Mallari, N. A., & Tabaranza, B. R. (1999). Threatened birds of the Philippines: The Haribon Foundation/BirdLife International Red Data Book. Bookmark.

Cita Chicago (17th ed.)

Collar, Nigel, Neil Aldrin Mallari, i Blas R. Tabaranza. Threatened Birds of the Philippines: The Haribon Foundation/BirdLife International Red Data Book. Makati City: Bookmark, 1999.

Cita MLA (9th ed.)

Collar, Nigel, et al. Threatened Birds of the Philippines: The Haribon Foundation/BirdLife International Red Data Book. Bookmark, 1999.