Gaya APA

zeithaml, V, A. et al (2013). SERVICES MARKETING INTEGRATING CUSTOMER FOCUS ACROSS THE FIRM (7). United States of America: MC GRAW HILL EDUCATION.

Gaya MLA

zeithaml, Valarie, A.. et al. "SERVICES MARKETING INTEGRATING CUSTOMER FOCUS ACROSS THE FIRM". 7 United States of America: MC GRAW HILL EDUCATION, 2013. Text.