Não informado. (1928). Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards.
Chicago-referens (17:e uppl.)Não informado. Bureau of Standards Journal Research. Washington: U.S. Department of Commerce, National Bureau of Standards, 1928.
MLA-referens (8:e uppl.)Não informado. Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.