Zikmund, W. G. (2010). Exploring Marketing Research 10th ed. South-Western Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Zikmund, William G. Exploring Marketing Research 10th Ed. South-Western Cengage Learning, 2010.
Lua MLA (8ú heag.)Zikmund, William G. Exploring Marketing Research 10th Ed. South-Western Cengage Learning, 2010.
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