Beri, G. C. (2018). Marketing Research (5th ed.). McGraw Hill Education (India) Pvt. Ltd.
Chicago-čujuhus (17. p.)Beri, G. C. Marketing Research. 5th ed. Chennai: McGraw Hill Education (India) Pvt. Ltd, 2018.
MLA-čujuhus (9. p.)Beri, G. C. Marketing Research. 5th ed. McGraw Hill Education (India) Pvt. Ltd, 2018.
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