Deming, W. Edwards, author
Sample design in business research
John Wiley & Sons, 1960
 Buku Teks
Cooper, Donald R., author
Business research methods
McGraw-Hill, 2001
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Zikmund, William G., author
Business research methods
The Dryden Press , 1991
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Zikmund, William G., author
Business research methods
The Dryden Press, 1988
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Cooper, Donald R., author
Business research method
McGraw-Hill, 2008
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