United States. National Bureau of Standards & American National Standards Institute. Marking of articles made of karat gold.
Chicago Style (17th ed.) CitationUnited States. National Bureau of Standards and American National Standards Institute. Marking of Articles Made of Karat Gold.
MLA (9th ed.) CitationUnited States. National Bureau of Standards and American National Standards Institute. Marking of Articles Made of Karat Gold.
Warning: These citations may not always be 100% accurate.