@book{126286,
	author = {Wolfram, Sybil,},
	title = {Philosophical logic :},
	publisher = {Routledge,},
	year = {1989.},
	address = {London ;},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0648/88023963-d.html}
}