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Aaker, David A., Kumar, V.. (1998). Marketing research 6th ed (6th ed). New York: John Wiley & Sons.

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Aaker, David A., Kumar, V.. Marketing research 6th ed. 6th ed New York: John Wiley & Sons, 1998. Text.

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Aaker, David A., Kumar, V.. Marketing research 6th ed. 6th ed New York: John Wiley & Sons, 1998. Text.

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Aaker, David A., Kumar, V.. Marketing research 6th ed. 6th ed New York: John Wiley & Sons, 1998. Print.