APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1939). Contribution to aerodynamics of rotating-wing aircraft. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Contribution to Aerodynamics of Rotating-wing Aircraft. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Contribution to Aerodynamics of Rotating-wing Aircraft. [s.n.], 1939.