@book{193263,
	author = {O'Sullivan, Daniel E., and ebrary, Inc.},
	title = {Chess in the Middle Ages and early modern age},
	publisher = {De Gruyter,},
	year = {c2012.},
	address = {Boston :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10606412}
}