Cooper, Donald R.
Business research methods
McGraw-Hill, 1998
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Zikmund, William G.
Business research methods
South-Western Cengage Learning, 2013
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Business research methods
by William G. Zikmund ... [and others]
South-Western Cengage Learning, 2013
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Saunders, Mark
Research methods for business students
Pearson Education, 2016
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Saunders, Mark
Research methods for business students
Prentice-Hall, 2003
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