APA (7th ed.) Citation

Smithsonian Institution. (1926). Observations on birds of Argentina, Paraguay, Uruguay, and Chile. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Observations on Birds of Argentina, Paraguay, Uruguay, and Chile. [Washington]: GPO, 1926.

MLA (9th ed.) Citation

Smithsonian Institution. Observations on Birds of Argentina, Paraguay, Uruguay, and Chile. GPO, 1926.

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