ZIKMUND, W. G. 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.
Lua MLA (8ú heag.)ZIKMUND, William G. Essentials of Marketing Reseach#William G. Zikmund. Dryden.
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