APA (7th ed.) Citation

Onions, C. T. (1966). The Oxford dictionary of English entymology. Oxford University Press.

Chicago Style (17th ed.) Citation

Onions, C. T. The Oxford Dictionary of English Entymology. Oxford: Oxford University Press, 1966.

MLA (9th ed.) Citation

Onions, C. T. The Oxford Dictionary of English Entymology. Oxford University Press, 1966.