Hobson, A. (2001). The Oxford dictionary of difficult words. Oxford University Press.
Cita Chicago (17th ed.)Hobson, Archie. The Oxford Dictionary of Difficult Words. New York: Oxford University Press, 2001.
Cita MLA (8th ed.)Hobson, Archie. The Oxford Dictionary of Difficult Words. Oxford University Press, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.