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Frege, Gottlob, P. T. Geach, Max Black, Gottlob Frege, and P. T. Geach. 1980. ‘“On Sense and Reference” from Translations from the Philosophical Writings of Gottlob Frege: P 36-56’. In , 3rd ed. Oxford: Blackwell.
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Grube, G. M. A., John M. Cooper, and Plato. 2002. ‘“Crito” from Five Dialogues’. In , 2nd ed. Indianapolis: Hackett. http://ebookcentral.proquest.com/lib/uea/detail.action?docID=473611.
Harry G. Frankfurt. 1973. ‘The Anarchism of Robert Paul Wolff’. Political Theory 1 (4): 405–14. http://www.jstor.org/stable/191060.
Heil, John, and John Heil. 2004a. ‘“Psychological Predicates” from Philosophy of Mind: A Guide and Anthology: P 158-167’. In . Oxford: Oxford University Press.
———. 2004b. ‘“The Logical Analysis of Psychology” from Philosophy of Mind: A Guide and Anthology: P 85-95’. In . Oxford: Oxford University Press.
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———. 2010b. ‘Chapter’. In Political Obligation, 96–100. New York: Palgrave Macmillan.
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Simmons, A. John. 1979a. ‘Chapter 7 [in] Moral Principles and Political Obligations’. In Moral Principles and Political Obligations. Princeton: Princeton University Press.
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Stroud, Barry. 1984. ‘Chapter 1 from The Significance of Philosophical Scepticism: P 1-38’. In . Oxford: Clarendon. http://ebookcentral.proquest.com/lib/uea/detail.action?docID=3053315.
Williams, Michael. 2001. ‘Chapter 5 from Problems of Knowledge: A Critical Introduction to Epistemology: P 58-68.’ In . Oxford: Oxford University Press.
Wolff, Jonathan. 1996. ‘Anarchism and Skepticism [in] For and against the State: New Philosophical Readings’. In For and against the State: New Philosophical Readings. Lanham, Md: Rowman & Littlefield. http://uea.eblib.com/patron/FullRecord.aspx?p=1331688.
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