COOPER DONALD R. (2009). BUSINESS RESEARCH METHODS. TATA MCGRAW-HILL.
Chicago Style (17. basım) AtıfCOOPER DONALD R. BUSINESS RESEARCH METHODS. NEW DELHI: TATA MCGRAW-HILL, 2009.
MLA (9th ed.) AtıfCOOPER DONALD R. BUSINESS RESEARCH METHODS. TATA MCGRAW-HILL, 2009.
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