Beyond the universal Turing machine
B. Jack Copeland & Richard Sylvan
Empiricism, Semantics, and Ontology
Rudolf Carnap
Semantic Realism and Kripke's Wittgenstein
George Wilson
Metaphysics: A Very Short Introduction
Stephen Mumford
Ideas: General Intorduction to Pure Phenomenology
Edmund Husserl
Capitalism, Socialism and Democracy
Joseph A. Schumpeter