@book{58207,
	author = {Kolchin, Peter. and ebrary, Inc.},
	title = {Unfree labor},
	publisher = {Belknap Press of Harvard University Press,},
	year = {1987.},
	address = {Cambridge, MA :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10314299}
}