@book{68994,
	author = {Worster, Donald, and ebrary, Inc.},
	title = {The wealth of nature},
	publisher = {Oxford University Press,},
	year = {1993.},
	address = {New York :},
	note = {Book of essays which previously appeared in various journals or books or given as lectures.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10086929}
}