@book{166382,
	author = {Lucas, J. R. and ebrary, Inc.},
	title = {The conceptual roots of mathematics},
	publisher = {Routledge,},
	year = {2000.},
	series = {International library of philosophy},
	address = {London ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10054723}
}