Letwin, S. R. (1998). The pursuit of certainty: David Hume, Jeremy Bentham, John Stuart Mill, Beatrice Webb. Liberty Fund.
Chicago Style (17th ed.) CitationLetwin, Shirley Robin. The Pursuit of Certainty: David Hume, Jeremy Bentham, John Stuart Mill, Beatrice Webb. Indianapolis: Liberty Fund, 1998.
MLA引文Letwin, Shirley Robin. The Pursuit of Certainty: David Hume, Jeremy Bentham, John Stuart Mill, Beatrice Webb. Liberty Fund, 1998.
警告：這些引文格式不一定是100％准確.