APA (7th ed.) Zitazioa

Peelen, E. (2005). Customer relationship management. Pearson.

Chicago Style (17th ed.) Zitazioa

Peelen, Ed. Customer Relationship Management. New Delhi: Pearson, 2005.

MLA (9th ed.) Zitazioa

Peelen, Ed. Customer Relationship Management. Pearson, 2005.