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HAWKINS, Del I.. (1993). Essentials of Marketing Research . New York: Macmillan Publ. Co.

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HAWKINS, Del I.. Essentials of Marketing Research. New York: Macmillan Publ. Co, 1993. Text.

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HAWKINS, Del I.. Essentials of Marketing Research. New York: Macmillan Publ. Co, 1993. Text.

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HAWKINS, Del I.. Essentials of Marketing Research. New York: Macmillan Publ. Co, 1993. Print.