APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1939). Cooling on front of air-cooled engine cylinder in conventional engine cowling. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Cooling on Front of Air-cooled Engine Cylinder in Conventional Engine Cowling. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Cooling on Front of Air-cooled Engine Cylinder in Conventional Engine Cowling. [s.n.], 1939.