Não informado. (1953). World agricultural situation. U.S. Department of Agriculture, Economic Research Service.
Chicago-referens (17:e uppl.)Não informado. World Agricultural Situation. Washington: U.S. Department of Agriculture, Economic Research Service, 1953.
MLA-referens (8:e uppl.)Não informado. World Agricultural Situation. U.S. Department of Agriculture, Economic Research Service, 1953.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.