APA (7th ed.) Citation

United States. Bureau of Biological Survey. (1939). Food habits of North American diving ducks. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Biological Survey. Food Habits of North American Diving Ducks. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Biological Survey. Food Habits of North American Diving Ducks. [s.n.], 1939.

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