APA
Zeithaml V. B. M. &. G. D., .Service Marketing : Intergrating Customer Focus Across The Firm .-6th ed .-978-1-25-902681-2. : TMH, New Delhi.
Chicago
Zeithaml V.A Bitner M.J & Gremler D.D, .Service Marketing : Intergrating Customer Focus Across The Firm .-6th ed .-978-1-25-902681-2. : TMH, New Delhi.
Harvard
Zeithaml V. B. M. &. G. D., .Service Marketing : Intergrating Customer Focus Across The Firm .-6th ed .-978-1-25-902681-2. : TMH, New Delhi.
MLA
Zeithaml V.A Bitner M.J & Gremler D.D, .: TMH, New Delhi. .