@book{156019,
	author = {Clayton, Andrew Charles, and ebrary, Inc.},
	title = {Introduction to level design for PC games},
	publisher = {Charles River Media,},
	year = {c2003.},
	address = {Hingham, Mass. :},
	edition = {1st ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10061202}
}