Não informado. (1924). Crops and markets. U.S. Department of Agriculture, Agricultural Marketing Service.
Chicago-referens (17:e uppl.)Não informado. Crops and Markets. Washington: U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
MLA-referens (8:e uppl.)Não informado. Crops and Markets. U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.