William G Zikmund. (2013). Business Research Methods.: 9th ed (9th ed.). Cenage.
Chicago-čujuhus (17. p.)William G Zikmund. Business Research Methods.: 9th Ed. 9th ed. United States: Cenage, 2013.
MLA-čujuhus (9. p.)William G Zikmund. Business Research Methods.: 9th Ed. 9th ed. Cenage, 2013.
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