Epistemology
Rumsfeld, Donald. Department of Defense news briefing. 12 Feb. 2002, Pentagon, Washington, DC, USA.
Locke, John. An Essay Concerning Human Understanding. London: Thomas Basset, 1690, bk. 2, ch. 1.
Locke, John. An Essay Concerning Human Understanding, edited by Pauline Phemister. Oxford University Press, 2008, bk. 2, ch. 1.
Pyrrho. Quoted in Lives and Opinions of Eminent Philosophers, written by Diogenes Laertius. c. 240 AD, bk. 9, ch. 11, sect. 72.
Pyrrho. Quoted in The Lives of Eminent Philosophers, written by Diogenes Laërtius, translated by Pamela Mensch, edited by James Miller. Oxford University Press, 2018, bk 9, ch. 11, sect. 72.
Quoted in Theaetetus, by Plato
Socrates. Quoted in Θεαίτητος [Theaetetus], written by Plato. c. 369 BC.
Socrates. Quoted in Theaetetus, written by Plato, translated by John McDowell. Oxford University Press, 2014.
Ruskin, John. Modern Painters. Vol. 3, London: Smith, Elder & Company, 1856, pt. 4, ch. 3.
Ruskin, John. Modern Painters 4. The Works of John Ruskin, edited by Edward Tyas Cook and Alexander Wedderburn. Vol. 6, Cambridge University Press, 2010, pt. 4, ch. 3.
Thomson, William. "Electrical Units of Measurement." 3 May 1883, Institute of Civil Engineers, London, England, UK. Lecture.