APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1939). Tandem air propellers. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Tandem Air Propellers. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Tandem Air Propellers. [s.n.], 1939.

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