@book{200321,
	author = {Hahn, Steven, and ebrary, Inc.},
	title = {The political worlds of slavery and freedom},
	publisher = {Harvard University Press,},
	year = {2009.},
	series = {Nathan I. Huggins lectures},
	address = {Cambridge, Mass. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10402534}
}