APA (7th ed.) Citation

Ridgway, R. (1919). The birds of North and Middle America. United States National Museum.

Chicago Style (17th ed.) Citation

Ridgway, Robert. The Birds of North and Middle America. Washington, D.C: United States National Museum, 1919.

MLA (9th ed.) Citation

Ridgway, Robert. The Birds of North and Middle America. United States National Museum, 1919.

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