@book{228371,
	author = {Gelman, Susan A. and ebrary, Inc.},
	title = {The essential child},
	publisher = {Oxford University Press,},
	year = {2003.},
	series = {Oxford series in cognitive development},
	address = {Oxford ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10211937}
}