APA Style

Zeithaml, V, A. et al (2018). Services marketing : integrating customer focus across the firm. Seventh Edition (Seventh Edition). New York: McGraw-Hill Education.

MLA Style

Zeithaml, Valarie, A. et al. "Services marketing : integrating customer focus across the firm. Seventh Edition". Seventh Edition New York: McGraw-Hill Education, 2018. Text.