Gaya APA

Zeithaml, V, A. et al (2009). Service marketing : integrating customer focus across the firm (5th ed. (International Edition)). Boston: McGraw Hill.

Gaya MLA

Zeithaml, Valarie, A.. et al. "Service marketing : integrating customer focus across the firm". 5th ed. (International Edition) Boston: McGraw Hill, 2009. BUKU.