APA (7th ed.) Citation

Hobson, A. e. (2001). The Oxford dictionary of difficult words. O.U.P.

Chicago Style (17th ed.) Citation

Hobson, Archie ed. The Oxford Dictionary of Difficult Words. New York: O.U.P, 2001.

MLA (9th ed.) Citation

Hobson, Archie ed. The Oxford Dictionary of Difficult Words. O.U.P, 2001.