Hobson, A. (2001). The Oxford dictionary of difficult words. Oxford University Press.
Chicago Style aipamenaHobson, Archie. The Oxford Dictionary of Difficult Words. New York: Oxford University Press, 2001.
MLA aipamenaHobson, Archie. The Oxford Dictionary of Difficult Words. Oxford University Press, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.