Não informado. (1939). Feed situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.
Chicagoスタイル(17版)引用形式Não informado. Feed Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
MLA(8版)引用形式Não informado. Feed Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
警告: この引用は必ずしも正確ではありません.