Zeithaml Valari. (2010). Services Marketing. TMH.
Lua i Stíl Chicago (17ú heag.)Zeithaml Valari. Services Marketing. New Delhi: TMH, 2010.
Lua MLA (9ú heag.)Zeithaml Valari. Services Marketing. TMH, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.