APA (7th ed.) Citation

Warburton, N. (2009). Free speech: A very short introduction. Oxford University Press.

Chicago Style (17th ed.) Citation

Warburton, Nigel. Free Speech: A Very Short Introduction. Oxford ; New York: Oxford University Press, 2009.

MLA (9th ed.) Citation

Warburton, Nigel. Free Speech: A Very Short Introduction. Oxford University Press, 2009.