Audi, Robert. Epistemology: A Contemporary Introduction to the Theory of Knowledge. 2nd ed. Vol. Routledge contemporary introductions to philosophy. New York: Routledge, 2002.
Ayer, A. J. Philosophical Essays. London: Macmillan, 1954.
Bennett, Jonathan. ‘Secondary Qualities’. In Learning from Six Philosophers: Descartes, Spinoza, Leibniz, Locke, Berkeley, Hume, 74–91. Oxford: Clarendon, 2001. https://doi.org/10.1093/0198250924.003.0005.
Burke, Michael. ‘Copper Statues and Pieces of Copper: A Challenge to the Standard Account’. Copper Statues and Pieces of Copper: A Challenge to the Standard Account 52 (1992). http://findit.bham.ac.uk/primo_library/libweb/action/display.do?tabs=detailsTab&ct=display&fn=search&doc=TN_proquest1293500646&indx=1&recIds=TN_proquest1293500646&recIdxs=0&elementId=0&renderMode=poppedOut&displayMode=full&frbrVersion=&frbg=&&dscnt=0&scp.scps=scope%3A%2844BIR_PDA1_DS%29%2Cscope%3A%2844BIR_ETH1_DS%29%2Cscope%3A%2844BIR_LGUI_DS%29%2Cscope%3A%2844BIR_PURE_FT%29%2Cscope%3A%2844BIR_ALEPH_DS%29%2Cscope%3A%2844BIR_MIM_DS+%29%2Cscope%3A%2844BIR_RLIST_DS%29%2Cscope%3A%2844BIR_ML_DS%29%2Cscope%3A%2844BIR_SFX_DS%29%2Cscope%3A%2844BIR_DR1_DS%29%2Cscope%3A%2844BIR_DR2_DS%29%2C44BIR_Ebsco_1%2Cprimo_central_multiple_fe&mode=Basic&vid=44BIR_VU1&srt=rank&tab=local&vl(freeText0)=Copper%20Statues%20and%20Pieces%20of%20Copper%3A%20A%20Challenge%20to%20the%20Standard%20Account&dum=true&dstmp=1505298488192.
Conee, Earl Brink 1950-. Riddles of Existence [Electronic Resource] : A Guided Tour of Metaphysics, 2005. http://findit.bham.ac.uk/primo_library/libweb/action/display.do?tabs=detailsTab&ct=display&fn=search&doc=44BIR_PDA1_DSebr10194211&indx=2&recIds=44BIR_PDA1_DSebr10194211&recIdxs=1&elementId=1&renderMode=poppedOut&displayMode=full&frbrVersion=&frbg=&&dscnt=0&scp.scps=scope%3A%2844BIR_PDA1_DS%29%2Cscope%3A%2844BIR_ETH1_DS%29%2Cscope%3A%2844BIR_LGUI_DS%29%2Cscope%3A%2844BIR_PURE_FT%29%2Cscope%3A%2844BIR_ALEPH_DS%29%2Cscope%3A%2844BIR_MIM_DS+%29%2Cscope%3A%2844BIR_RLIST_DS%29%2Cscope%3A%2844BIR_ML_DS%29%2Cscope%3A%2844BIR_SFX_DS%29%2Cscope%3A%2844BIR_DR1_DS%29%2Cscope%3A%2844BIR_DR2_DS%29%2C44BIR_Ebsco_1%2Cprimo_central_multiple_fe&mode=Basic&vid=44BIR_VU1&srt=rank&tab=local&vl(freeText0)=riddles%20of%20existence&dum=true&dstmp=1505297810314.
Descartes, René, and John Cottingham. Meditations on First Philosophy: With Selections from the Objections and Replies. Rev. ed. Vol. Cambridge texts in the history of philosophy. Cambridge: Cambridge University Press, 1996.
———. Meditations on First Philosophy: With Selections from the Objections and Replies : A Latin-English Edition. Cambridge, England: Cambridge University Press, 2013. https://www.cambridge.org/core/books/rene-descartes-meditations-on-first-philosophy/35981334D95E74F1D4AD4EADCD796920.
Earl Conee , and  Theodore Sider. Riddles of Existence : A Guided Tour of Metaphysics: New Edition. OUP Oxford, 2014. https://ebookcentral.proquest.com/lib/oasispreview/reader.action?docID=1794211.
Frankfurt, Harry G. ‘Alternate Possibilities and Moral Responsibility’. The Journal of Philosophy 66, no. 23 (4 December 1969). https://doi.org/10.2307/2023833.
Jack, Smart. ‘The Mind/Brain Identity Theory’, n.d. https://plato.stanford.edu/entries/mind-identity/.
Locke, John, and R. S. Woolhouse. An Essay Concerning Human Understanding. Vol. Penguin classics. London: Penguin, 1997.
Nagel, Thomas. ‘What Is It Like to Be a Bat?’ The Philosophical Review 83, no. 4 (October 1974). https://doi.org/10.2307/2183914.
Shafer-Landau, Russ. Ethical Theory: An Anthology. 2nd ed. Vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013. http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20.
———. Ethical Theory: An Anthology. 2nd ed. Vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013. http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20.
———. Ethical Theory: An Anthology. 2nd ed. Vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013. http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20.
———. Ethical Theory: An Anthology. 2nd ed. Vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013. http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20.
———. Ethical Theory: An Anthology. 2nd ed. Vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013. http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20.