Existentialism: A Very Short Introduction
Thomas R. Flynn
Delphi Collected Works of Karl Marx
Karl Marx & Friedrich Engels
Creating Wealth: Growing Local Economies with Local Currencies
Gwendolyn Hallsmith & Bernard A. Lietaer
Beantwortung der Frage: Was ist Aufklärung?
Immanuel Kant
The Computer and the Brain
John von Neumann
Beyond the universal Turing machine
B. Jack Copeland & Richard Sylvan