APA (7th ed.) Citation

(2017). The U.S. Army in the World War I era. Center of Military History, United States Army.

Chicago Style (17th ed.) Citation

The U.S. Army in the World War I Era. Washington, D.C.: Center of Military History, United States Army, 2017.

MLA (9th ed.) Citation

The U.S. Army in the World War I Era. Center of Military History, United States Army, 2017.