APA (7th ed.) Citation

United States. Army. Air Corps. (1920). Aerial observation for all arms. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Aerial Observation for All Arms. Washington: U.S. GPO, 1920.

MLA (9th ed.) Citation

United States. Army. Air Corps. Aerial Observation for All Arms. U.S. GPO, 1920.

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