APA (7th ed.) Citation

Howell, S. N. G. (2003). Hummingbirds of North America: The photographic guide. Princeton University Press.

Chicago Style (17th ed.) Citation

Howell, Steve N. G. Hummingbirds of North America: The Photographic Guide. Princeton: Princeton University Press, 2003.

MLA (8th ed.) Citation

Howell, Steve N. G. Hummingbirds of North America: The Photographic Guide. Princeton University Press, 2003.

Warning: These citations may not always be 100% accurate.