@book{33716,
	author = {O'Brien, Michael J. and ebrary, Inc.},
	title = {Innovation in cultural systems},
	publisher = {MIT Press,},
	year = {2009.},
	series = {Vienna series in theoretical biology},
	address = {Cambridge, Mass. ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10347249}
}