Não informado. (1984). Current farm economics. Oklahoma Agricultural Experiment Station.
Cita Chicago Style (17a ed.)Não informado. Current Farm Economics. Stillwater, Okla: Oklahoma Agricultural Experiment Station, 1984.
Cita MLA (8a ed.)Não informado. Current Farm Economics. Oklahoma Agricultural Experiment Station, 1984.
Precaución: Estas citas no son 100% exactas.