Zikmund,William G. (2013). Essentials of Marketing Research (5th.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Zikmund,William G. Essentials of Marketing Research. 5th. Australia: Cengage Learning, 2013.
Lua MLA (9ú heag.)Zikmund,William G. Essentials of Marketing Research. 5th. Cengage Learning, 2013.
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