Philosophy of Mathematics: Selected Readings, Paperback
Paul Benacerraf
Ibn al-Haytham's Geometrical Methods and the Philosophy of Mathematics
Model Theory and the Philosophy of Mathematical Practice
Conceptions of Set and the Foundations of Mathematics
Luca Incurvati
The Foundations of Arithmetic: A Logico-Mathematical Enquiry Into the Concept of Number, Paperback (2nd Ed.)
Gottlob Frege
Proofs and Refutations: The Logic of Mathematical Discovery, Paperback
Imre Lakatos