@book{16243,
	author = {Clemson, David. and Clemson, Wendy. and ebrary, Inc.},
	title = {Mathematics in the early years},
	publisher = {Routledge,},
	year = {1994.},
	series = {Teaching and learning in the first three years of school},
	address = {London ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=5001606}
}