@book{138922,
	author = {Duchan, Joshua S. and ebrary, Inc.},
	title = {Powerful voices},
	publisher = {University of Michigan Press,},
	year = {c2012.},
	series = {Tracking pop},
	address = {Ann Arbor :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10547403}
}