Cooper, D. R. (2006). Business Research Methods (3rd ed.). Tata McGraw Hill Publishing.
Chicago-viite (17. p.)Cooper, Donald R. Business Research Methods. 3rd ed. New Delhi: Tata McGraw Hill Publishing, 2006.
MLA-viite (9. p.)Cooper, Donald R. Business Research Methods. 3rd ed. Tata McGraw Hill Publishing, 2006.
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