You have chosen 'Phenomenalism' by A.J. Ayer, 'Cours d'Analyse' by Augustin-Louis Cauchy and 'Mental Acts: their content and their objects' by Peter Geach
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |