Cooper, D. R. (2006). Marketing research. New York: McGraw-Hill/Irwin.
Trích dẫn kiểu ChicagoCooper, Donald R. Marketing Research. New York: McGraw-Hill/Irwin, 2006.
Deismireacht MLACooper, Donald R. Marketing Research. New York: McGraw-Hill/Irwin, 2006.
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