APA (7th ed.) Citation

United States. Extension Service. (1940). Grain grading primer. [s.n.].

Chicago Style (17th ed.) Citation

United States. Extension Service. Grain Grading Primer. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. Extension Service. Grain Grading Primer. [s.n.], 1940.

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