- Formigari, Lia (18)
- Locke, John <1632-1704> (4)
- Bentham, Jeremy <1748-1832> (2)
- Defoe, Daniel (2)
- Hampson, Norman (2)
- James, Henry <1843-1916> (2)
- Langer, Susanne K. (2)
- Lovejoy, Arthur O. (2)
- Herder, Johann Gottfried : von (1)
- Morris, William <1834-1896> (1)
- Restaino, Franco (1)
- Russell, Bertrand (1)
- Wollheim, Richard (1)