APA (7th ed.) Zitazioa
Dean, M. Opportunities: Intermediate : Language Powerbook. Pearson.
Chicago Style (17th ed.) Zitazioa
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Harlow, Inglaterra: Pearson.
MLA (9th ed.) Zitazioa
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Pearson.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.