Gaya APA

Zeithaml, V, A. (2013). Services Marketing : Integrating Customer Focus Across The Firm sixth edition (sixth edition). New York: McGraw-Hill Education.

Gaya MLA

Zeithaml, Valarie, A.. "Services Marketing : Integrating Customer Focus Across The Firm sixth edition". sixth edition New York: McGraw-Hill Education, 2013. MM.