CHURCHILL GILBERT A. (2004). BASIC MARKETING RESEARCH (5TH.). SOUTH-WESTERN COLLEGE PUBLISHING CO.
Lua i Stíl Chicago (17ú heag.)CHURCHILL GILBERT A. BASIC MARKETING RESEARCH. 5TH. OHIO: SOUTH-WESTERN COLLEGE PUBLISHING CO, 2004.
Lua MLA (9ú heag.)CHURCHILL GILBERT A. BASIC MARKETING RESEARCH. 5TH. SOUTH-WESTERN COLLEGE PUBLISHING CO, 2004.
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