APA (7th ed.) Citation

Onions, C. T., Burchfield, R. W., & Friedrichsen, G. W. S. (1966). The Oxford dictionary of English etymology. Clarendon Press.

Chicago Style (17th ed.) Citation

Onions, C. T., R. W. Burchfield, and G. W. S. Friedrichsen. The Oxford Dictionary of English Etymology. Oxford: Clarendon Press, 1966.

MLA (9th ed.) Citation

Onions, C. T., et al. The Oxford Dictionary of English Etymology. Clarendon Press, 1966.