@book{131365,
	author = {Sanford, David H.,},
	title = {If P, then Q :},
	publisher = {Routledge,},
	year = {2004.},
	address = {London ;},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0701/2002036920-d.html}
}