Não informado. (2001). Annual report of the United States Department of Agriculture. U.S. Department of Agriculture.
Citação do estilo Chicago (17ª ed.)Não informado. Annual Report of the United States Department of Agriculture. Washington: U.S. Department of Agriculture, 2001.
Citação MLA (8ª ed.)Não informado. Annual Report of the United States Department of Agriculture. U.S. Department of Agriculture, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.