APA (7th ed.) Citation

Ek, C. W. (1988). Wheat classification. Congressional Research Service, Library of Congress.

Chicago Style (17th ed.) Citation

Ek, Carl W. Wheat Classification. [Washington, D.C.]: Congressional Research Service, Library of Congress, 1988.

MLA (9th ed.) Citation

Ek, Carl W. Wheat Classification. Congressional Research Service, Library of Congress, 1988.