APA (7th ed.) Citation

Knowlton, F. H., Ridgway, R., & Lucas, F. A. (1909). Birds of the world: A popular account. Holt.

Chicago Style (17th ed.) Citation

Knowlton, Frank Hall, Robert Ridgway, and Frederic A. Lucas. Birds of the World: A Popular Account. New York: Holt, 1909.

MLA (9th ed.) Citation

Knowlton, Frank Hall, et al. Birds of the World: A Popular Account. Holt, 1909.