What is single-source research, and what is its connection to the universal product codes (UPCs) one finds

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What is single-source research, and what is its connection to the universal product codes (UPCs) one finds on nearly every product in the grocery store?
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Advertising and Integrated Brand Promotion

ISBN: 978-0538473323

6th edition

Authors: Thomas O'Guinn, Chris Allen, Richard Semenik

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