Burchfield, R. W. (1987). A supplement to the Oxford English dictionary, Vols. I - IV: Ed. by R. W. Buchfield. Clarendon Press.

Burchfield, Robert W. A Supplement to the Oxford English Dictionary, Vols. I - IV: Ed. by R. W. Buchfield. Oxford [u.a.]: Clarendon Press, 1987.

Burchfield, Robert W. A Supplement to the Oxford English Dictionary, Vols. I - IV: Ed. by R. W. Buchfield. Clarendon Press, 1987.