Não informado. (1961). Illinois agricultural economics. University of Illinois, Department of Agricultural Economics.
Style de citation Chicago (17e éd.)Não informado. Illinois Agricultural Economics. Urbana, Ill: University of Illinois, Department of Agricultural Economics, 1961.
Style de citation MLA (8e éd.)Não informado. Illinois Agricultural Economics. University of Illinois, Department of Agricultural Economics, 1961.
Attention : ces citations peuvent ne pas être correctes à 100%.