Não informado. (2004). Ers. U.S. Department of Agriculture, Economic Research Service.
Chicagoスタイル(17版)引用形式Não informado. Ers. Washington: U.S. Department of Agriculture, Economic Research Service, 2004.
MLA(8版)引用形式Não informado. Ers. U.S. Department of Agriculture, Economic Research Service, 2004.
警告: この引用は必ずしも正確ではありません.