Craven, R. (2002). Customer is king: How to exceed their expectations. Virgin Books.
Lua i Stíl Chicago (17ú heag.)Craven, Robert. Customer Is King: How to Exceed Their Expectations. London: Virgin Books, 2002.
Lua MLA (9ú heag.)Craven, Robert. Customer Is King: How to Exceed Their Expectations. Virgin Books, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.