Não informado. (1925). Technical news bulletin of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards.
Chicago-referens (17:e uppl.)Não informado. Technical News Bulletin of the National Bureau of Standards. Washington: U.S. Department of Commerce, National Bureau of Standards, 1925.
MLA-referens (8:e uppl.)Não informado. Technical News Bulletin of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards, 1925.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.