@book{87825,
	author = {Carlos, Ann M. and Lewis, Frank D. and ebrary, Inc.},
	title = {Commerce by a frozen sea},
	publisher = {University of Pennsylvania Press,},
	year = {c2010.},
	address = {Philadelphia :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10576071}
}