APA (7th ed.) Zitazioa
Oxenden, C. English file: Student's book (20a. ed.).
Chicago Style (17th ed.) Zitazioa
Oxenden, Clive. English File: Student's Book. 20a. ed.
MLA (9th ed.) Zitazioa
Oxenden, Clive. English File: Student's Book. 20a. ed.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.