Zikmund, W. G. (2003). Business research methods (7th ed.). Thomson/South-Western.
Lua i Stíl Chicago (17ú heag.)Zikmund, William G. Business Research Methods. 7th ed. Mason, OH: Thomson/South-Western, 2003.
Lua MLA (8ú heag.)Zikmund, William G. Business Research Methods. 7th ed. Thomson/South-Western, 2003.
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