Gaya APA

Zeithaml, V, A. et al (2013). Service Marketing Integrating Customer Focus Across the Firm (Sixth). United States of America: Irwin McGraw-Hill.

Gaya MLA

Zeithaml, Valarie, A.. et al. "Service Marketing Integrating Customer Focus Across the Firm". Sixth United States of America: Irwin McGraw-Hill, 2013. Textbook.