Timm, P. R. (2014). Customer service: Career success through customer loyalty (Sixth Edition.). Pearson.
Chicago-viite (17. p.)Timm, Paul R. Customer Service: Career Success Through Customer Loyalty. Sixth Edition. Boston: Pearson, 2014.
MLA-viite (9. p.)Timm, Paul R. Customer Service: Career Success Through Customer Loyalty. Sixth Edition. Pearson, 2014.
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