Não informado. (1978). Farmer cooperatives. Department of Agriculture, Agricultural Cooperative Service.
Chicago-referens (17:e uppl.)Não informado. Farmer Cooperatives. Washington: Department of Agriculture, Agricultural Cooperative Service, 1978.
MLA-referens (8:e uppl.)Não informado. Farmer Cooperatives. Department of Agriculture, Agricultural Cooperative Service, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.