APA Style

Zeithaml, V, A., Bitner, M, J. (2006). Services Marketing; Integrating Customer Focus Agross the Firm, 4th Ed. . New York: McGraw-Hill.

MLA Style

Zeithaml, Valarie, A.., Bitner, Mary, Jo. "Services Marketing; Integrating Customer Focus Agross the Firm, 4th Ed.". New York: McGraw-Hill, 2006. Text.