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Brown, James Robert. Philosophy of Mathematics: A Contemporary Introduction to the World of Proofs and Pictures. 2nd ed. New York: Routledge, 2008. Web. <https://ezproxy.lib.gla.ac.uk/login?url=https://doi.org/10.4324/9780203932964>.
George, Alexander, and Daniel J. Velleman. Philosophies of Mathematics. Malden, MA.: Blackwell Publishers, 2002. Web. <https://contentstore.cla.co.uk//secure/link?id=fdb2cedc-ec40-e911-80cd-005056af4099>.
Grayling, A. C. Philosophy. Oxford: Oxford University Press, 1998. Web. <https://contentstore.cla.co.uk//secure/link?id=3e3bedd4-ec40-e911-80cd-005056af4099>.
Shapiro, Stewart. Thinking about Mathematics: The Philosophy of Mathematics. New York: Oxford University Press, 2000. Web. <https://contentstore.cla.co.uk//secure/link?id=06cf28eb-ec40-e911-80cd-005056af4099>.
