You have chosen 'Intensional Logic' by Melvin Fitting, 'On the General Idea of Proof Theory' by Dag Prawitz and 'Reasoning and the Logic of Things' by Charles Sanders Peirce
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |