Citace podle APA (7th ed.)

West, G. C., & Butler, C. A. (2010). Do hummingbirds hum?: Fascinating answers to questions about hummingbirds. Rutgers University Press.

Citace podle Chicago (17th ed.)

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

Citace podle MLA (9th ed.)

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

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