APA (7th ed.) Citation

Hornby, A. S., & Cowie, A. P. (1989). Oxford advanced learner's dictionary of current English (4th ed. / A.P. Cowie.). University Press.

Chicago Style (17th ed.) Citation

Hornby, Albert Sydney, and Anthony Paul Cowie. Oxford Advanced Learner's Dictionary of Current English. 4th ed. / A.P. Cowie. Oxford [etc.]: University Press, 1989.

MLA (9th ed.) Citation

Hornby, Albert Sydney, and Anthony Paul Cowie. Oxford Advanced Learner's Dictionary of Current English. 4th ed. / A.P. Cowie. University Press, 1989.