1.
Shapiro, S.: Thinking about mathematics: the philosophy of mathematics. Oxford University Press, New York (2000).
2.
Bostock, D.: Philosophy of mathematics: an introduction. Wiley-Blackwell, Chichester (2009).
3.
Tiles, M.: Mathematics and the image of reason. Routledge, London (1991).
4.
Grayling, A.C.: Philosophy. Oxford University Press, Oxford (1998).
5.
Benacerraf, P., Putnam, H.: Philosophy of mathematics: selected readings. Cambridge University Press, Cambridge (1983).
6.
Copi, I.M.: The theory of logical types. Routledge & Kegan Paul, London (1971).
7.
Chihara, C.S.: Ontology and the vicious-circle principle. Cornell University Press, Ithaca, N.Y. (1973).