1.- D.W. Hamlyn.
METAPHYSICS.
Cambridge University Press, 1984.
2.- CHISHOLM, RODERICK M.
THEORY OF KNOWLEDGE
Prentice Hall. 1989
3.- Williams, Bernard Arthur Owen.
Ethics and the limits of philosophy
Harvard University Press
4.- WITTGENSTEIN, LUDWIG
PHILOSOPHICAL INVESTIGATIONS
BRACKWELLPUB.COM
IMPORTANT LINKS
The Problems of Philosophy
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