United States. Bureau of Standards. (1939). Gypsum, publications by the staff of the National Bureau of Standards. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Standards. Gypsum, Publications by the Staff of the National Bureau of Standards. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Bureau of Standards. Gypsum, Publications by the Staff of the National Bureau of Standards. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.