Não informado. (1984). Current farm economics. Oklahoma Agricultural Experiment Station.
Style de citation Chicago (17e éd.)Não informado. Current Farm Economics. Stillwater, Okla: Oklahoma Agricultural Experiment Station, 1984.
Style de citation MLA (8e éd.)Não informado. Current Farm Economics. Oklahoma Agricultural Experiment Station, 1984.
Attention : ces citations peuvent ne pas être correctes à 100%.