APA (7th ed.) Citation

Hilty, S. L., Brown, W. L., & Tudor, G. (1986). A guide to the birds of Colombia. Princeton University Press.

Chicago Style (17th ed.) Citation

Hilty, Steven L., William L. Brown, and Guy Tudor. A Guide to the Birds of Colombia. New Jersey: Princeton University Press, 1986.

MLA (9th ed.) Citation

Hilty, Steven L., et al. A Guide to the Birds of Colombia. Princeton University Press, 1986.