Oxenden, C. (1997). English file: Workbook. Oxford: Oxford University Press.
Chicago Style aipamenaOxenden, Clive. English File: Workbook. Oxford: Oxford University Press, 1997.
MLA aipamenaOxenden, Clive. English File: Workbook. Oxford: Oxford University Press, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.