APA (7th ed.) Citation

United States. Agricultural Marketing Service. (1940). Marketing commercial lettuce. [s.n.].

Chicago Style (17th ed.) Citation

United States. Agricultural Marketing Service. Marketing Commercial Lettuce. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. Agricultural Marketing Service. Marketing Commercial Lettuce. [s.n.], 1940.

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