Não informado. (2000). Technical news from the National Bureau of Standards. U.S. Department of Commerce.
Chicago-referens (17:e uppl.)Não informado. Technical News from the National Bureau of Standards. Washington: U.S. Department of Commerce, 2000.
MLA-referens (8:e uppl.)Não informado. Technical News from the National Bureau of Standards. U.S. Department of Commerce, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.