@book{226201,
	author = {Ginsburgh, Victor. and Weber, Shlomo. and ebrary, Inc.},
	title = {How many languages do we really need?},
	publisher = {Princeton University Press,},
	year = {2011.},
	address = {Princeton, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10456318}
}