@book{51299,
	author = {Thornton, Stephanie, and ebrary, Inc.},
	title = {Children solving problems},
	publisher = {Harvard University Press,},
	year = {1995.},
	series = {The developing child},
	address = {Cambridge, MA :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10331346}
}