@book{223,
	author = {Sayer, Jeffrey. and Campbell, B. M.},
	title = {The Science of sustainable development :},
	publisher = {Cambridge University Press,},
	year = {c2004.},
	address = {Cambridge, U.K. ;},
	url = {http://www.loc.gov/catdir/samples/cam041/2003055143.html}
}