Não informado. (1962). Foreign Agricultural Trade of the United States. U.S. Department of Agriculture, Economic Research Service.
Chicago-referens (17:e uppl.)Não informado. Foreign Agricultural Trade of the United States. Washington: U.S. Department of Agriculture, Economic Research Service, 1962.
MLA-referens (8:e uppl.)Não informado. Foreign Agricultural Trade of the United States. U.S. Department of Agriculture, Economic Research Service, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.