@book{251809,
	author = {Sowder, Judith T. and Sowder, Larry.},
	title = {Reconceptualizing mathematics :},
	publisher = {W.H. Freeman and Co.,},
	year = {c2010.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy1210/2009935437-d.html}
}