United States. Bureau of Standards. (1938). Commercial Standard, CS67-38: Marking Articles Made of Karat Gold. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Standards. Commercial Standard, CS67-38: Marking Articles Made of Karat Gold. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States. Bureau of Standards. Commercial Standard, CS67-38: Marking Articles Made of Karat Gold. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.