Zeithami, V. &. O. (2012). Service marketing (5 th.).
Chicago Style aipamenaZeithami, Valarie & Others. Service Marketing. 5 th. Delhi, 2012.
MLA aipamenaZeithami, Valarie & Others. Service Marketing. 5 th. 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.