(2005). Face2face: Elementary class audio CDs. New York, US: Cambridge University Press.
Chicago Style aipamenaFace2face: Elementary Class Audio CDs. New York, US: Cambridge University Press, 2005.
MLA aipamenaFace2face: Elementary Class Audio CDs. New York, US: Cambridge University Press, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.