Cita APA (7a ed.)

Mill, J. S., & Gray, J. (1991). On liberty and other essays. Oxford University Press.

Cita Chicago Style (17a ed.)

Mill, John Stuart, y John Gray. On Liberty and Other Essays. Oxford, New York: Oxford University Press, 1991.

Cita MLA (9a ed.)

Mill, John Stuart, y John Gray. On Liberty and Other Essays. Oxford University Press, 1991.