Cita APA (7th ed.)
Oxenden, C. English file: Listen and speak (1a.ed.). Oxford University Press.
Cita Chicago (17th ed.)
Oxenden, Clive. English File: Listen and Speak. 1a.ed. Oxford University Press.
Cita MLA (9th ed.)
Oxenden, Clive. English File: Listen and Speak. 1a.ed. Oxford University Press.
Atenció: Aquestes cites poden no estar 100% correctes.