Wittgenstein Ludwig

Ludwig Wittgenstein. Opmerkingen over de kleuren
Vertaling en annotatie:Paul Wijdeveld
Boom, Meppel,Amsterdam, 1989

Ludwig Wittgenstein. Philosophical investigations
Translated by G.E.M. Anscombe
Basil Blackwell,  Oxford UK, 1988

Ludwig Wittgenstein. Tractatus Logico-Philosophicus
Translation by C.K. Ogden
Introduction by Bertrand Russell
Routlidge & Kegan Paul, London and New York, 1986