Timm, P. R. (2002). 50 powerful ideas you can use to keep your customers (3rd ed.). Career Press.
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Chicago-čujuhus (17. p.)
Timm, Paul R. 50 Powerful Ideas You Can Use to Keep Your Customers. 3rd ed. Franklin Lakes, NJ: Career Press, 2002.
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MLA-čujuhus (9. p.)
Timm, Paul R. 50 Powerful Ideas You Can Use to Keep Your Customers. 3rd ed. Career Press, 2002.
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