1. Allison, Henry E. (1983) Kant's Transcendental Idealism: An Interpretation and Defense, New Haven and London: Yale University Press.
2. Appiah, Kwame Anthony (2007) Cosmopolitanism: Ethics in a World of Strangers, New York and London: W.W. Norton and Company.
3. Dewey, John (1980) Human Nature and Conduct, New York: Prometheus Books.
4. Dewey, John (1991) Logic: The Theory of Inquiry, The Later Works, 1938, Volume 12, Carbondale: Southern Illinois Press.
5. Habermas, Jürgen: (2005) Truth and Justification, Cambridge, MA: MIT Press.