APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1938). N. A. C. A. optical engine indicator. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. N. A. C. A. Optical Engine Indicator. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. N. A. C. A. Optical Engine Indicator. [s.n.], 1938.