APA (7th ed.) Citation

Hornby, A. S., Wehmeier, S., & Ashby, M. Oxford Advanced Learner's Dictionary of Current English (Sixth Edition.).

Chicago Style (17th ed.) Citation

Hornby, A S., Sally Wehmeier, and Michael Ashby. Oxford Advanced Learner's Dictionary of Current English. Sixth Edition.

MLA (8th ed.) Citation

Hornby, A S., et al. Oxford Advanced Learner's Dictionary of Current English. Sixth Edition.