APA (7th ed.) Citation

Hobson, R. D. (1979). Definition and use of the phi grade scale. U.S. Army, Corps of Engineers, Coastal Engineering Research Center.

Chicago Style (17th ed.) Citation

Hobson, R. D. Definition and Use of the Phi Grade Scale. Fort Belvoir, Va.: U.S. Army, Corps of Engineers, Coastal Engineering Research Center, 1979.

MLA (9th ed.) Citation

Hobson, R. D. Definition and Use of the Phi Grade Scale. U.S. Army, Corps of Engineers, Coastal Engineering Research Center, 1979.