Não informado. Studies in economics and business. University of Minnesota.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Studies in Economics and Business. Minneapolis, Minn: University of Minnesota.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Studies in Economics and Business. University of Minnesota.
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