Cita APA (7th ed.)
Timm, P. R. (2002). 50 powerful ideas you can use to keep your customers (3rd ed.). Career Press.
Cita Chicago (17th ed.)
Timm, Paul R. 50 Powerful Ideas You Can Use to Keep Your Customers. 3rd ed. Franklin Lakes, NJ: Career Press, 2002.
Cita MLA (9th ed.)
Timm, Paul R. 50 Powerful Ideas You Can Use to Keep Your Customers. 3rd ed. Career Press, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.