COOPER, D. R. &. O. (2012). BUSINESS RESEARCH METHODS (4TH.).
Chicago-čujuhus (17. p.)COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. NEWDELHI, 2012.
MLA-čujuhus (9. p.)COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. 2012.
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