APA (7th ed.) Citation

Oxford University Press, Simpson, J. A., & Weiner, E. S. C. (1989). The Oxford English dictionary (2nd ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Oxford University Press, J. A. Simpson, and E. S. C. Weiner. The Oxford English Dictionary. 2nd ed. Oxford: Clarendon Press, 1989.

MLA (9th ed.) Citation

Oxford University Press, et al. The Oxford English Dictionary. 2nd ed. Clarendon Press, 1989.