Kumar, V. (2013). Profitable customer engagement: Concept, metrics and strategies. Sage response.
Čikaški stil citiranjaKumar, V. Profitable Customer Engagement: Concept, Metrics and Strategies. New Delhi: Sage response, 2013.
MLA način citiranjaKumar, V. Profitable Customer Engagement: Concept, Metrics and Strategies. Sage response, 2013.
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