Brouwer, L.E.J. "Intuitionsim and Formalism," Philosophy of Mathematics: Selected Readings. Paul Benacerraf and Hilary Putnam ed. Cambridge: Cambridge University Press, 1998.
Carnap, Rudolf. "The Logicist Foundations of Mathematics,"Philosophy of Mathematics: Selected Readings. Paul Benacerraf and Hilary Putnam ed. Cambridge: Cambridge University Press, 1998.
Frege, Gottlob. "The Concept of Number," Philosophy of Mathematics: Selected Readings. Paul Benacerraf and Hilary Putnam ed. Cambridge: Cambridge University Press, 1998.
Hersh, Reuben. "Some Proposals for Reviving the Philosophy of Mathematics," New Directions in the Philosophy of Mathematics. Thomas Tymoczko, ed. Princeton: Princeton University Press, 1998.
Heyting, Arend. "The Intuitionist Foundations of Mathematics," Philosophy of Mathematics: Selected Readings. Paul Benacerraf and Hilary Putnam ed. Cambridge: Cambridge University Press, 1998.
Kant, Immanuel. Critique of Pure Reason 1781. Buffalo: Prometheus Books, 1990.
Lakatos, Imre. "A Renaissance of Empiricism in the Recent Philosophy of Mathematics?" New Directions in the Philosophy of Mathematics. Thomas Tymoczko, ed. Princeton: Princeton University Press, 1998.
Von Neumann, Johann. "The Formalist Foundations of Mathematics," Philosophy of Mathematics: Selected Readings. Paul Benacerraf and Hilary Putnam ed. Cambridge: Cambridge University Press, 1998.