Παραπομπή APA

Zeithaml, V. A. (1996). Services marketing. McGraw-Hill.

Παραπομπή Chicago Style

Zeithaml, Valarie A. Services Marketing. New York: McGraw-Hill, 1996.

Παραπομπή MLA

Zeithaml, Valarie A. Services Marketing. McGraw-Hill, 1996.