APA aipamena

Zeithaml, V. A. (2003). Services marketing ed.3. McGraw-Hill.

Chicago Style aipamena

Zeithaml, Valarie A. Services Marketing Ed.3. McGraw-Hill, 2003.

MLA aipamena

Zeithaml, Valarie A. Services Marketing Ed.3. McGraw-Hill, 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.