APA

Mill J. S., Mill J. S., Smith G. W. & Gray J. (1991). J. S. Mill "On liberty" in focus. London: Routledge.

Chicago

Mill John Stuart, Mill John Stuart, Smith G W and Gray John. 1991. J. S. Mill "On liberty" in focus. London: Routledge.

Harvard

Mill J. S., Mill J. S., Smith G. W. and Gray J. (1991). J. S. Mill "On liberty" in focus. London: Routledge.

MLA

Mill John Stuart, Mill John Stuart, Smith G W and Gray John. J. S. Mill "On liberty" in focus. London: Routledge. 1991.