APA aipamena

Zeithaml, V. A. (2013). Services Marketing (6th.). McGraw Hill.

Chicago Style aipamena

Zeithaml, Valarie A. Services Marketing. 6th. New Delhi: McGraw Hill, 2013.

MLA aipamena

Zeithaml, Valarie A. Services Marketing. 6th. McGraw Hill, 2013.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.