On formally undecidable propositions of Principia Mathematica ...
Kurt Gödel & Martin Hirzel
Reflections on the Pure Theory of Money of Mr. J.M. Keynes
Friedrich August von Hayek
Mind-Energy, lectures and essays
Henri Bergson
Beast and Man: The Roots of Human Nature
Mary Midgley
Process and Action: Relevant Theory and Logics
Richard Sylvan