Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'A Specimen of Discoveries' by Gottfried Leibniz and 'Through the Looking Glass' by Lewis Carroll (C.Dodgson)

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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