ZIKMUND I , B. C. (2013). BUSINESS RESEARCH METHODS (9TH.). CENGAGE.
Chicago-čujuhus (17. p.)ZIKMUND I , BABIN CARR. BUSINESS RESEARCH METHODS. 9TH. NEW DELHI: CENGAGE, 2013.
MLA-čujuhus (9. p.)ZIKMUND I , BABIN CARR. BUSINESS RESEARCH METHODS. 9TH. CENGAGE, 2013.
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