1. Benacerraf, P. 1965. What Numbers Could Not Be. In Philosophy of Mathematics: Selected Readings [1983], ed. P. Benacerraf and H. Putnam, 272–294. Cambridge: Cambridge U.P.
2. Benacerraf, P. 1973. Mathematical Truth. In Philosophy of Mathematics: Selected Readings [1983], ed. P. Benacerraf and H. Putnam, 403–420. Cambridge: Cambridge U.P.
3. Bergson, H. 1907. L’Évolution créatrice. Paris: Félix Alcan.
4. Brown, J.R. 1999. Philosophy of Mathematics. An Introduction to the World of Proofs and Pictures. London: Routledge.
5. Bueno, G. 1972. Ensayos Materialistas. Madrid: Taurus.