Não informado. (1987). The Journal of Agricultural Economics Research. U.S. Department of Agriculture.
Chicagoスタイル(17版)引用形式Não informado. The Journal of Agricultural Economics Research. Washington: U.S. Department of Agriculture, 1987.
MLA(8版)引用形式Não informado. The Journal of Agricultural Economics Research. U.S. Department of Agriculture, 1987.
警告: この引用は必ずしも正確ではありません.