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.
警告：这些引文格式不一定是100％准确.
