Não informado. (1960). Oklahoma current farm economics. Oklahoma Agricultural Experiment Station.
Chicagoスタイル(17版)引用形式Não informado. Oklahoma Current Farm Economics. Stillwater, Okla: Oklahoma Agricultural Experiment Station, 1960.
MLA(8版)引用形式Não informado. Oklahoma Current Farm Economics. Oklahoma Agricultural Experiment Station, 1960.
警告: この引用は必ずしも正確ではありません.