- Bertrand Russell,The Problems of Philosophy, orig. 1912. There are two recent editions: an English one with an Introduction by J. Skorupski, and an American one. OUP, with an introduction by J. Perry. Both are good.)
- E L Gettier, "Is Justified True Belief Knowledge?" easy to find at: http://philosophyfaculty.ucsd.edu/faculty/rarneson/courses/gettierphilrea ding.pdf
Original 1963, "Is Justified True Belief Knowledge?", in the public domain for instance in: http://philosophyfaculty.ucsd.edu/faculty/rarneson/courses/gettierphilrea ding.pdf
- D K Lewis, "Elusive knowledge", in Australasian Journal of Philosophy, vol. 74, 1996, pp. 549-567, rist. in Lewis Papers in Metaphysics and Epistemology (1999).
You find it here:
- Nicla Vassallo, Teoria della conoscenza, Bari-Roma, Laterza 2003, or Tommaso Piazza, Che Cos'è la conoscenza), Roma, Carocci 2017.
(Instead you can read either Roderick Chisholm'Introduc-tion, III ed., or Lehrer, or any up to date good Introduction to the Philosophy of Knowledge, or the epistemological voices in the Stanford Encyclopedia of Philosophy.)
Texts for integration (non-attending students)
- Any good Introduction to Russell, as the voice "Russell" in the Stanford Enc. of Philosophy, free on line.)
- K R Popper, Three Worlds, in Michigan Quarterly Review, n. 1, 1979.