1. The vexed question of authorship: Views of researchers in a British medical faculty;Bhopal;British Medical Journal,1997
2. Craig, Edward 1998. Routledge encyclopedia of philosophy. London: Routledge.
3. Social processes and proofs of theorems and programs;Millo;Communications of the Association for Computing Machinery,1979
4. Descartes: Meditations on First Philosophy