APA Format
Zeithaml, Valarie A.;Parasuraman, A.;Berry, Leonard L. . (). Delivering Quality Service : Balancing customer perceptions and expectations. :
MLA Format
Zeithaml, Valarie A.;Parasuraman, A.;Berry, Leonard L. . Delivering Quality Service : Balancing customer perceptions and expectations. : ,
Australian/Harvard Format
Zeithaml, Valarie A.;Parasuraman, A.;Berry, Leonard L. . . Delivering Quality Service : Balancing customer perceptions and expectations. , 
Warning: These citations may not always be 100% accurate.