Combining Texts

You have chosen 'The Mind and the Soul' by Jenny Teichmann, 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach and 'What are Sets and What are they For?' by Oliver,A/Smiley,T

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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