Cita APA (7th ed.)

Butterfield, J. (2007). Oxford A-Z of English usage. Oxford University Press.

Cita Chicago (17th ed.)

Butterfield, Jeremy. Oxford A-Z of English Usage. Oxford: Oxford University Press, 2007.

Cita MLA (9th ed.)

Butterfield, Jeremy. Oxford A-Z of English Usage. Oxford University Press, 2007.