Não informado. (1970). Commerce today. U.S. Department of Commerce.
Chicago-referens (17:e uppl.)Não informado. Commerce Today. Washington: U.S. Department of Commerce, 1970.
MLA-referens (8:e uppl.)Não informado. Commerce Today. U.S. Department of Commerce, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.