Cita APA (7th ed.)
Timm, P. R. (1992). 50 ways to keep your customers: "and get new ones". Jack Wilson and Associates.
Cita Chicago (17th ed.)
Timm, Paul R. 50 Ways to Keep Your Customers: "And Get New Ones". Illonois, Chicago: Jack Wilson and Associates, 1992.
Cita MLA (9th ed.)
Timm, Paul R. 50 Ways to Keep Your Customers: "And Get New Ones". Jack Wilson and Associates, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.