@book{25165,
	author = {Magnusson, Roberta J., and ebrary, Inc.},
	title = {Water technology in the Middle Ages},
	publisher = {The Johns Hopkins University Press,},
	year = {2001.},
	series = {Johns Hopkins studies in the history of technology},
	address = {Baltimore :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10021637}
}