APA (7th ed.) Citation

United States. Army. (1920). Synopsis of professional subjects for instruction of balloon observers. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Synopsis of Professional Subjects for Instruction of Balloon Observers. Washington: U.S. GPO, 1920.

MLA (9th ed.) Citation

United States. Army. Synopsis of Professional Subjects for Instruction of Balloon Observers. U.S. GPO, 1920.