Zikmund, William G.
Business research methods
The Dryden Press, 1988
 Buku Teks
Zikmund, William G.
Business research methods
South-Western Cengage Learning, 2013
 Buku Teks
Business research methods
by William G. Zikmund ... [and others]
South-Western Cengage Learning, 2013
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Cooper, Donald R.
Business research methods
McGraw-Hill, 1998
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Zikmund, William G.
Business research methods
The Dryden Press , 1991
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