Cita APA (7th ed.)
Mill, J. S., & Himmelfarb, G. (1974). On liberty. Penguin.
Cita Chicago (17th ed.)
Mill, John Stuart, i Gertrude Himmelfarb. On Liberty. Harmondsworth ; Baltimore [etc.]: Penguin, 1974.
Cita MLA (9th ed.)
Mill, John Stuart, i Gertrude Himmelfarb. On Liberty. Penguin, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.