Não informado. (1970). Energy. U.S. Department of Commerce, National Technical Information Service.
Chicago-referens (17:e uppl.)Não informado. Energy. Springfield, Va: U.S. Department of Commerce, National Technical Information Service, 1970.
MLA-referens (8:e uppl.)Não informado. Energy. U.S. Department of Commerce, National Technical Information Service, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.