APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1937). Photographic study of combustion and knock in spark℗--ignition engine. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Photographic Study of Combustion and Knock in Spark℗--ignition Engine. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Photographic Study of Combustion and Knock in Spark℗--ignition Engine. [s.n.], 1937.