Não informado. (1944). Illinois business review. University of Illinois, Bureau of Economic and Business Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Illinois Business Review. Urbana, Ill: University of Illinois, Bureau of Economic and Business Research, 1944.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Illinois Business Review. University of Illinois, Bureau of Economic and Business Research, 1944.
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