APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Air Medical Service. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Air Medical Service. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Air Medical Service. GPO, 1921.

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