Cook, S. (2011). Customer care excellence: How to create an effective customer focus (6th ed.). Kogan Page.
Lua i Stíl Chicago (17ú heag.)Cook, Sarah. Customer Care Excellence: How to Create an Effective Customer Focus. 6th ed. London ; Philadelphia: Kogan Page, 2011.
Lua MLA (9ú heag.)Cook, Sarah. Customer Care Excellence: How to Create an Effective Customer Focus. 6th ed. Kogan Page, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.