Gaya APA

Zeithaml, V, A. et al (2013). SERVICES MARKETING : Integrating Customer Focus Across the Firm (6). New York: McGraw Hill.

Gaya MLA

Zeithaml, Valarie, A.. et al. "SERVICES MARKETING : Integrating Customer Focus Across the Firm". 6 New York: McGraw Hill, 2013. Text.