Não informado. (1999). Miscellaneous Publications. U.S. Department of Commerce, National Bureau of Standards.
Chicago-referens (17:e uppl.)Não informado. Miscellaneous Publications. Washington: U.S. Department of Commerce, National Bureau of Standards, 1999.
MLA-referens (8:e uppl.)Não informado. Miscellaneous Publications. U.S. Department of Commerce, National Bureau of Standards, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.