@book{560,
	author = {Christensen, Kit Richard.},
	title = {Philosophy and choice :},
	publisher = {McGraw Hill,},
	year = {c2002.},
	address = {Boston :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0702/2001030296-d.html}
}