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