1. T. S. Kuhn, The Structure of Scientific Revolutions, The University of  Chicago Press, 1970.

2. M. Kaku, Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the Tenth Dimension, Oxford University Press, 1994.

3. S. Nasar, A Beautiful Mind, Touchstone Book, 1998.

4. M. Livio, The Golden Ratio, Broadway Books, 2002.