Churchill, G. A., & Churchill, G. A. (2001). Basic marketing research 4th ed. The Dryden.
Lua i Stíl Chicago (17ú heag.)Churchill, Gilbert A., agus Gilbert A. Churchill. Basic Marketing Research 4th Ed. The Dryden, 2001.
Lua MLA (8ú heag.)Churchill, Gilbert A., agus Gilbert A. Churchill. Basic Marketing Research 4th Ed. The Dryden, 2001.
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