You have chosen 'A Discourse on Method' by René Descartes, 'Concepts without Boundaries' by Mark Sainsbury and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |