Combining Texts

You have chosen 'What is Logic?st1=Ian Hacking' by , 'Causes and Conditions' by J.L. Mackie and 'A World of States of Affairs' by David M. Armstrong

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge