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