A. D. M. Walker. ‘Obligations of Gratitude and Political Obligation’. Philosophy & Public Affairs, vol. 18, no. 4, 1989, pp. 359–64, http://www.jstor.org/stable/2265477.
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Frege, Gottlob, et al. ‘On Sense and Reference’ from Translations from the Philosophical Writings of Gottlob Frege: P 36-56. 3rd ed, Blackwell, 1980.
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Grube, G. M. A., et al. ‘Crito’ from Five Dialogues. 2nd ed, Hackett, 2002, http://ebookcentral.proquest.com/lib/uea/detail.action?docID=473611.
Harry G. Frankfurt. ‘The Anarchism of Robert Paul Wolff’. Political Theory, vol. 1, no. 4, 1973, pp. 405–14, http://www.jstor.org/stable/191060.
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———. ‘The Logical Analysis of Psychology’ from Philosophy of Mind: A Guide and Anthology: P 85-95. Oxford University Press, 2004.
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———. ‘Chapter’. Political Obligation, Palgrave Macmillan, 2010, pp. 96–100.
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Simmons, A.J. ‘Philosophical Anarchism [in] For and against the State: New Philosophical Readings’. For and against the State: New Philosophical Readings, Rowman & Littlefield, 1996, http://uea.eblib.com/patron/FullRecord.aspx?p=1331688. Electronic resource.
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Stroud, Barry. Chapter 1 from The Significance of Philosophical Scepticism: P 1-38. Clarendon, 1984, http://ebookcentral.proquest.com/lib/uea/detail.action?docID=3053315.
Williams, Michael. Chapter 5 from Problems of Knowledge: A Critical Introduction to Epistemology: P 58-68. Oxford University Press, 2001.
Wolff, Jonathan. ‘Anarchism and Skepticism [in] For and against the State: New Philosophical Readings’. For and against the State: New Philosophical Readings, Rowman & Littlefield, 1996, http://uea.eblib.com/patron/FullRecord.aspx?p=1331688. Electronic resource.
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