Não informado. (1984). Current farm economics. Oklahoma Agricultural Experiment Station.
Chicagoスタイル(17版)引用形式Não informado. Current Farm Economics. Stillwater, Okla: Oklahoma Agricultural Experiment Station, 1984.
MLA(8版)引用形式Não informado. Current Farm Economics. Oklahoma Agricultural Experiment Station, 1984.
警告: この引用は必ずしも正確ではありません.