(2009). Face2face: Advanced student's book. New York, US: Cambridge University Press.
Chicago Style aipamenaFace2face: Advanced Student's Book. New York, US: Cambridge University Press, 2009.
MLA aipamenaFace2face: Advanced Student's Book. New York, US: Cambridge University Press, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.