Cita APA (7th ed.)
Oxenden, C. English file: Teacher's book (9a. ed.).
Cita Chicago (17th ed.)
Oxenden, Clive. English File: Teacher's Book. 9a. ed.
Cita MLA (9th ed.)
Oxenden, Clive. English File: Teacher's Book. 9a. ed.
Atenció: Aquestes cites poden no estar 100% correctes.