Malhotra, N. K., Wills, P., & Birks, D. F. (2012). Marketing research: An applied approach (4th ed.). Pearson.
Lua i Stíl Chicago (17ú heag.)Malhotra, Naresh K., Peter Wills, agus David F. Birks. Marketing Research: An Applied Approach. 4th ed. Harlow, England: Pearson, 2012.
Lua MLA (9ú heag.)Malhotra, Naresh K., et al. Marketing Research: An Applied Approach. 4th ed. Pearson, 2012.
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