[1]
S. Shapiro, Thinking about mathematics: the philosophy of mathematics. New York: Oxford University Press, 2000.
[2]
D. Bostock, Philosophy of mathematics: an introduction. Chichester: Wiley-Blackwell, 2009.
[3]
M. Tiles, Mathematics and the image of reason, vol. Philosophical issues in science. London: Routledge, 1991 [Online]. Available: https://www.vlebooks.com/vleweb/product/openreader?id=GlasgowUni&isbn=9781134967728
[4]
A. C. Grayling, Philosophy. Oxford: Oxford University Press, 1998.
[5]
P. Benacerraf and H. Putnam, Philosophy of mathematics: selected readings, 2nd ed. Cambridge: Cambridge University Press, 1983.
[6]
I. M. Copi, The theory of logical types, vol. Monographs in modern logic series. London: Routledge & Kegan Paul, 1971.
[7]
C. S. Chihara, Ontology and the vicious-circle principle. Ithaca, N.Y.: Cornell University Press, 1973.