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COOPER, DONALD. (2003). BUSINESS RESEARCH METHODS EIGHTH EDITION . NEW YORK: MCGRAW HILL.

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COOPER, DONALD. BUSINESS RESEARCH METHODS EIGHTH EDITION. NEW YORK: MCGRAW HILL, 2003. Text.

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COOPER, DONALD. BUSINESS RESEARCH METHODS EIGHTH EDITION. NEW YORK: MCGRAW HILL, 2003. Text.

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COOPER, DONALD. BUSINESS RESEARCH METHODS EIGHTH EDITION. NEW YORK: MCGRAW HILL, 2003. Print.