APA (7th ed.) Citation

United States. Army. Air Corps. (1919). Principal parts of airplane engines. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Principal Parts of Airplane Engines. Washington: U.S. GPO, 1919.

MLA (9th ed.) Citation

United States. Army. Air Corps. Principal Parts of Airplane Engines. U.S. GPO, 1919.

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