APA (7e ed.) Bronvermelding

Não informado. (1961). Illinois agricultural economics. University of Illinois, Department of Agricultural Economics.

Chicago (17e ed.) Bronvermelding

Não informado. Illinois Agricultural Economics. Urbana, Ill: University of Illinois, Department of Agricultural Economics, 1961.

MLA (8e ed.) Bronvermelding

Não informado. Illinois Agricultural Economics. University of Illinois, Department of Agricultural Economics, 1961.

Let op: Deze citaties zijn niet altijd 100% accuraat.