Widdowson, H. G. (2003). Linguistics. Oxford: Oxford University Press.
Chicago Style aipamenaWiddowson, H. G. Linguistics. Oxford: Oxford University Press, 2003.
MLA aipamenaWiddowson, H. G. Linguistics. Oxford: Oxford University Press, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.