APA (7th ed.) Citation

United States. Army. (1920). General notes on organization and tactics indispensable to balloon observer. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. General Notes on Organization and Tactics Indispensable to Balloon Observer. Washington: U.S. GPO, 1920.

MLA (9th ed.) Citation

United States. Army. General Notes on Organization and Tactics Indispensable to Balloon Observer. U.S. GPO, 1920.

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