APA (7th ed.) Citation

United States. Army. Air Corps. (1918). Work of observer. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Work of Observer. Washington: U.S. GPO, 1918.

MLA (8th ed.) Citation

United States. Army. Air Corps. Work of Observer. U.S. GPO, 1918.

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