APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1937). Aircraft Circulars: Armstrong Whitworth 27 "Ensign" commercial airplane (British), An all-metal high-wing monoplane. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Aircraft Circulars: Armstrong Whitworth 27 "Ensign" Commercial Airplane (British), An All-metal High-wing Monoplane. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Aircraft Circulars: Armstrong Whitworth 27 "Ensign" Commercial Airplane (British), An All-metal High-wing Monoplane. [s.n.], 1937.