@book{126228,
	author = {Wittgenstein, Ludwig, and Pears, David,},
	title = {Tractatus logico-philosophicus /},
	publisher = {Routledge,},
	year = {1974.},
	series = {Routledge classics},
	address = {London :},
	edition = {Rev. ed.},
	note = {Includes index.}
}