Não informado. (1978). Farmer cooperatives. Department of Agriculture, Agricultural Cooperative Service.
Citação do estilo Chicago (17ª ed.)Não informado. Farmer Cooperatives. Washington: Department of Agriculture, Agricultural Cooperative Service, 1978.
Citação MLA (8ª ed.)Não informado. Farmer Cooperatives. Department of Agriculture, Agricultural Cooperative Service, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.
