APA (7th ed.) Zitazioa

Zeller, D. (2008). Telephone sales for dummies. Wiley.

Chicago Style (17th ed.) Zitazioa

Zeller, Dirk. Telephone Sales for Dummies. Hoboken, NJ: Wiley, 2008.

MLA (9th ed.) Zitazioa

Zeller, Dirk. Telephone Sales for Dummies. Wiley, 2008.