1. Bertrand Russell, The Principles of Mathematics, 2nd edn. (London: Allen and Unwin: 1937; 1st edn., 1903).
2. Bertrand Russell, ?The axiom of infinity? (1904), reprinted in [5], pp. 256?259.
3. Bertrand Russell, ?Mathematical logic as based on the theory of types? (1908), reprinted in [6], pp. 59?102.
4. Bertrand Russell and A. N. Whitehead, Principia Mathematica, 2nd edn. (Cambridge: Cambridge University Press, 1925?27; 1st edn. 1910?13), 3 vols.
5. Bertrand Russell, Essays in Analysis, ed. by Douglas Lackey, (London: Allen and Unwin, 1973).