APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Corps of Engineers: General provisions. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Corps of Engineers: General Provisions. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Corps of Engineers: General Provisions. U.S. GPO, 1921.

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