Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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