APA (7th ed.) Citation

United States. Bureau of Standards. (1938). Journal of Research of the National Bureau of Standards, May 1938, Vol. 20, No. 5. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Standards. Journal of Research of the National Bureau of Standards, May 1938, Vol. 20, No. 5. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Standards. Journal of Research of the National Bureau of Standards, May 1938, Vol. 20, No. 5. [s.n.], 1938.