1. E.T. Bell: Men of Mathematics ( Pelican Books, London 1953 )
2. P. Benacerraf, H. Putnam (eds.): Philosophy of Mathematics; Selected Readings ( Blackwell, Oxford 1964 )
3. J.-P. van Bendegem: Finite, Empirical Mathematics; Outline of a Model ( Rijksuniversiteit Gent, Gent 1987 )
4. H.-N. Castaíïeda: ‘Arithmetic and Reality’. Australasian Journal of Philosophy 37 (1959) pp. 92–107;
5. H.-N. Castaíïeda: reprinted in Benacerraf and Putnam (1964), pp. 404–71