Não informado. (2004). Foreign crops and markets. U.S. Department of Agriculture, Foreign Agricultural Service.
Chicago-referens (17:e uppl.)Não informado. Foreign Crops and Markets. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 2004.
MLA-referens (8:e uppl.)Não informado. Foreign Crops and Markets. U.S. Department of Agriculture, Foreign Agricultural Service, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.