Tucker, R. (2000). Customer service for the new millennium. East west Books.
Lua i Stíl Chicago (17ú heag.)Tucker, Robert. Customer Service for the New Millennium. Chennai: East west Books, 2000.
Lua MLA (9ú heag.)Tucker, Robert. Customer Service for the New Millennium. East west Books, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.