Cita APA (7th ed.)

Collar, N. J., Mallari, N. A. D., Tabaranza, B. R., & Crosby, M. J. (1999). Threatened birds of the Philippines: The Haribon Foundation/BirdLife International Red data book. Bookmark.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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