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Dyfyniad Arddull ChicagoKumar, V. Marketing Research: A Global Outlook. New Delhi: SAGE Publications India Pvt. Ltd, 2015.
Dyfyniad MLAKumar, V. Marketing Research: A Global Outlook. SAGE Publications India Pvt. Ltd, 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.