Churchill, G. A. (1992). Basic Marketing Research Gilbert A Churchil. The Dryden Press.
Lua i Stíl Chicago (17ú heag.)Churchill, Gilbert A. Basic Marketing Research Gilbert A Churchil. The Dryden Press, 1992.
Lua MLA (8ú heag.)Churchill, Gilbert A. Basic Marketing Research Gilbert A Churchil. The Dryden Press, 1992.
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