Não informado. (1961). Illinois agricultural economics. University of Illinois, Department of Agricultural Economics.
Čikaški stil citiranja (17. izdanje)Não informado. Illinois Agricultural Economics. Urbana, Ill: University of Illinois, Department of Agricultural Economics, 1961.
MLA način citiranja (8. izdanje)Não informado. Illinois Agricultural Economics. University of Illinois, Department of Agricultural Economics, 1961.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.