Cita APA (7th ed.)
Zeller, D. (2008). Telephone sales for dummies. Wiley.
Cita Chicago (17th ed.)
Zeller, Dirk. Telephone Sales for Dummies. Hoboken, NJ: Wiley, 2008.
Cita MLA (9th ed.)
Zeller, Dirk. Telephone Sales for Dummies. Wiley, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.