Combining Texts

You have chosen 'What is the Basis of Moral Obligation?' by H.A. Prichard, 'Word and Object' by Willard Quine and 'Mathematics without Numbers' by Geoffrey Hellman

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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