Cita APA (7a ed.)

West, G. C., & Butler, C. A. (2010). Do Hummingbirds Hum?: Fascinating Answers to Questions about Hummingbirds. Rutgers University Press.

Cita Chicago Style (17a ed.)

West, George C., y Carol A. Butler. Do Hummingbirds Hum?: Fascinating Answers to Questions About Hummingbirds. New Brunswick, N.J.: Rutgers University Press, 2010.

Cita MLA (8a ed.)

West, George C., y Carol A. Butler. Do Hummingbirds Hum?: Fascinating Answers to Questions About Hummingbirds. Rutgers University Press, 2010.