Tweddle,Sally, Adams,Anthony, & Clarke, S. (1997). English for tomorrow. Open University Press.
Chicago Style aipamenaTweddle,Sally, Adams,Anthony, và Stephen Clarke. English for Tomorrow. Open University Press, 1997.
MLA aipamenaTweddle,Sally, Adams,Anthony, và Stephen Clarke. English for Tomorrow. Open University Press, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.