APA (7th ed.) Citation

United States. National Bureau of Standards. (1940). Ground and polished lenses for sun glasses. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Bureau of Standards. Ground and Polished Lenses for Sun Glasses. [Washington]: [publisher not identified], 1940.

MLA (9th ed.) Citation

United States. National Bureau of Standards. Ground and Polished Lenses for Sun Glasses. [publisher not identified], 1940.

Warning: These citations may not always be 100% accurate.