@book{48531,
	author = {Norton, Bryan G. and ebrary, Inc.},
	title = {Searching for sustainability},
	publisher = {Cambridge University Press,},
	year = {2003.},
	series = {Cambridge studies in philosophy and biology},
	address = {Cambridge, UK ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10064324}
}