Gaya APA

Zeithaml, V, A, D. (2013). Services Marketing : Integrating Customer Focus Across the Firm (6). Singapore: McGraw-Hill Education.

Gaya MLA

Zeithaml, Valarie, A, Dkk. "Services Marketing : Integrating Customer Focus Across the Firm". 6 Singapore: McGraw-Hill Education, 2013. Text.