@book{121316,
	author = {Railton, Peter Albert.},
	title = {Facts, values, and norms :},
	publisher = {Cambridge University Press,},
	year = {2003.},
	series = {Cambridge studies in philosophy},
	address = {Cambridge, U.K. ;},
	url = {http://www.loc.gov/catdir/description/cam031/2002066522.html}
}