Dyfyniad APA

COOPER, D. R. &. O. (2012). BUSINESS RESEARCH METHODS (4TH.).

Dyfyniad Arddull Chicago

COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. NEWDELHI, 2012.

Dyfyniad MLA

COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. 2012.

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