Cooper, D. R. S. (2010). Business Research Methods (11th.). Tata McGraw Hill.
Chicago-čujuhus (17. p.)Cooper, Donald R.; Schindler. Business Research Methods. 11th. NEw Delhi: Tata McGraw Hill, 2010.
MLA-čujuhus (9. p.)Cooper, Donald R.; Schindler. Business Research Methods. 11th. Tata McGraw Hill, 2010.
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