Kuhn, T. S. (2012). The structure of scientific revolutions: 50th anniversary edition. Chicago, USA: University of Chicago Press.
Kuhn, T. S. (2011). Objectivity, value judgment, and theory choice, in T. S. Kuhn (Ed.), The essential tension: Selected studies in scientific tradition and change (pp. 320-339). Chicago: University of Chicago Press. Retrieved from http://ebookcentral.proquest.com