Não informado. Milk Production. U.S. Department of Agriculture, Agricultural Marketing Service.
Citação do estilo Chicago (17ª ed.)Não informado. Milk Production. Washington: U.S. Department of Agriculture, Agricultural Marketing Service.
Citação MLA (8ª ed.)Não informado. Milk Production. U.S. Department of Agriculture, Agricultural Marketing Service.
Atenció: Aquestes cites poden no estar 100% correctes.