COOPER DONALD R. (2007). BUSINESS RESEARCH METHODS 9TH ED (9TH ED.). TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.
Citace podle Chicago (17th ed.)COOPER DONALD R. BUSINESS RESEARCH METHODS 9TH ED. 9TH ED. NEW DELHI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2007.
Citace podle MLA (9th ed.)COOPER DONALD R. BUSINESS RESEARCH METHODS 9TH ED. 9TH ED. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2007.
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