APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1940). Knocking in an Internal-Combustion Engine. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Knocking in an Internal-Combustion Engine. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Knocking in an Internal-Combustion Engine. [s.n.], 1940.