APA (7th ed.) Citation

HORNBY, A. (1972). The progressive English dictionary (2nd ed.). O.U.P..

Chicago Style (17th ed.) Citation

HORNBY, A.S. The Progressive English Dictionary. 2nd ed. London: O.U.P., 1972.

MLA (9th ed.) Citation

HORNBY, A.S. The Progressive English Dictionary. 2nd ed. O.U.P., 1972.