ZIKMUND, W. G. (1999). Essentials of marketing reseach - William G. Zikmund. Dryden.
Lua i Stíl Chicago (17ú heag.)ZIKMUND, William G. Essentials of Marketing Reseach - William G. Zikmund. Dryden, 1999.
Lua MLA (8ú heag.)ZIKMUND, William G. Essentials of Marketing Reseach - William G. Zikmund. Dryden, 1999.
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