APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Use of airplanes by officers on leave. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Use of Airplanes by Officers on Leave. Washington: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Use of Airplanes by Officers on Leave. [publisher not identified], 1921.

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