@book{54125,
	author = {Koster, Raph. and ebrary, Inc.},
	title = {A theory of fun for game design},
	publisher = {Paraglyph Press,},
	year = {c2005.},
	address = {Scottsdale, AZ :},
	note = {"Foreword by Will Wright."},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10080000}
}