@book{248252,
	author = {Burghardt, Gordon M., and ebrary, Inc.},
	title = {The genesis of animal play},
	publisher = {MIT Press,},
	year = {c2005.},
	address = {Cambridge, Mass. :},
	note = {"A Bradford book."},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10173532}
}