APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1937). The Hafner A. R. III gyroplane (British). [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. The Hafner A. R. III Gyroplane (British). [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. The Hafner A. R. III Gyroplane (British). [s.n.], 1937.