Tull, D. S. (2000). Marketting Research/6e (6th ed.). New delhi.
Chicago Edition CitationTull, Donald S. Marketting Research/6e. 6th ed. Prentice - Hall: New delhi, 2000.
Deismireacht MLATull, Donald S. Marketting Research/6e. 6th ed. New delhi, 2000.
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