Wirtz,Jochen & others. (2018). Services Marketing (8.). Pearson.
Chicago Style aipamenaWirtz,Jochen & others. Services Marketing. 8. Nodia: Pearson, 2018.
MLA aipamenaWirtz,Jochen & others. Services Marketing. 8. Pearson, 2018.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.