Problems of the Millenium - The Riemann Hypothesis - Essay
E. Bombieri
Chapter 28. - Philosophy of Mathematics
Hilary Putnam
Postautonomous Ego Development: A Study of Its Nature and Measurement
Susanne R. Cook-Greuter
What the Bleep - Chapter 1 - Great Questions
Fred Alan Wolf
Great books of the Western World - Volume 54
Encyclopaedia Britannica, Inc.
Essays on Marx's Theory of Value
Isaak Ilʹich Rubin & Miloš Samardźija & Fredy Perlman