Tractatus logico-philosophicus / Ludwig Wittgenstein ; translated by D.F. Pears and B.F. McGuinness ; with an introduction by Bertrand Russell. Wittgenstein, Ludwig, 1889-1951. Pears, David, 1921-2009. tr. McGuinness, Brian. tr. Logic, Symbolic and mathematical. 164 WIT Includes index. London : Routledge, 1974. 1974. 1975 Text xxv, 106 p. : eng Routledge classics