John Stuart Mill (2008). “Utilitarianism and On Liberty: Including 'Essay on Bentham' and Selections from the Writings of Jeremy Bentham and John Austin”, p.187, John Wiley & Sons
John Stuart Mill (1867). “Thoughts on parliamentary reform. Recent writers on reform. Bain's psychology. A few words on non-intervention. The contest in America. Austin on jurisprudence. Plato”, p.204