Não informado. (1944). Illinois business review. University of Illinois, Bureau of Economic and Business Research.
Chicago-referens (17:e uppl.)Não informado. Illinois Business Review. Urbana, Ill: University of Illinois, Bureau of Economic and Business Research, 1944.
MLA-referens (8:e uppl.)Não informado. Illinois Business Review. University of Illinois, Bureau of Economic and Business Research, 1944.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.