APA (7th ed.) Citation

Oxford University Press & Allen, R. E. (1986). The Oxford spelling dictionary. Oxford University Press.

Chicago Style (17th ed.) Citation

Oxford University Press and R. E. Allen. The Oxford Spelling Dictionary. Oxford: Oxford University Press, 1986.

MLA (8th ed.) Citation

Oxford University Press and R. E. Allen. The Oxford Spelling Dictionary. Oxford University Press, 1986.