United States. National Bureau of Standards. (1940). Supplement to National Bureau of Standards Circular C398, Standard Samples Issued or in Preparation by the National Bureau of Standards, 1940 Supplement. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. National Bureau of Standards. Supplement to National Bureau of Standards Circular C398, Standard Samples Issued or in Preparation by the National Bureau of Standards, 1940 Supplement. [Washington]: [publisher not identified], 1940.
MLA (9th ed.) CitationUnited States. National Bureau of Standards. Supplement to National Bureau of Standards Circular C398, Standard Samples Issued or in Preparation by the National Bureau of Standards, 1940 Supplement. [publisher not identified], 1940.
Warning: These citations may not always be 100% accurate.