@book{208960,
	author = {Bartle, Richard A. and ebrary, Inc.},
	title = {Beyond game design},
	publisher = {Course Terchnology/Cengage Learning,},
	year = {c2009.},
	address = {Boston, Mass. ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10359300}
}