Richards, J. C. (1993). English for International Communication: Workbook ( Interchange). Cambridge: Cambridge University.
Chicago Style aipamenaRichards, Jack C. English for International Communication: Workbook ( Interchange). Cambridge: Cambridge University, 1993.
MLA aipamenaRichards, Jack C. English for International Communication: Workbook ( Interchange). Cambridge: Cambridge University, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.